664241520 has 160 divisors (see below), whose sum is σ = 2242713600. Its totient is φ = 161989632.

The previous prime is 664241519. The next prime is 664241521. The reversal of 664241520 is 25142466.

664241520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (664241519) and next prime (664241521).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664241521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 129729 + ... + 134751.

It is an arithmetic number, because the mean of its divisors is an integer number (14016960).

Almost surely, 2^664241520 is an apocalyptic number.

664241520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664241520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1121356800).

664241520 is an abundant number, since it is smaller than the sum of its proper divisors (1578472080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664241520 is a wasteful number, since it uses less digits than its factorization.

664241520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5087 (or 5081 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 664241520 is about 25772.8834242504. The cubic root of 664241520 is about 872.5198973030.

Adding to 664241520 its reverse (25142466), we get a palindrome (689383986).

The spelling of 664241520 in words is "six hundred sixty-four million, two hundred forty-one thousand, five hundred twenty".