66401532 has 120 divisors (see below), whose sum is σ = 185391360. Its totient is φ = 20684160.

The previous prime is 66401521. The next prime is 66401539. The reversal of 66401532 is 23510466.

66401532 is a `hidden beast` number, since 6 + 640 + 15 + 3 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 66401496 and 66401505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66401539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 347557 + ... + 347747.

It is an arithmetic number, because the mean of its divisors is an integer number (1544928).

Almost surely, 2^66401532 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66401532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92695680).

66401532 is an abundant number, since it is smaller than the sum of its proper divisors (118989828).

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

66401532 is a wasteful number, since it uses less digits than its factorization.

66401532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273 (or 262 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 66401532 is about 8148.7135180960. The cubic root of 66401532 is about 404.9418846653.

Adding to 66401532 its reverse (23510466), we get a palindrome (89911998).

The spelling of 66401532 in words is "sixty-six million, four hundred one thousand, five hundred thirty-two".