664322551 has 8 divisors (see below), whose sum is σ = 671481504. Its totient is φ = 657175200.

The previous prime is 664322543. The next prime is 664322569. The reversal of 664322551 is 155223466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 664322551 - 2³ = 664322543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664322051) 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 7 ways as a sum of consecutive naturals, for example, 160261 + ... + 164353.

It is an arithmetic number, because the mean of its divisors is an integer number (83935188).

Almost surely, 2^664322551 is an apocalyptic number.

664322551 is a deficient number, since it is larger than the sum of its proper divisors (7158953).

664322551 is a wasteful number, since it uses less digits than its factorization.

664322551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5801.

The product of its digits is 43200, while the sum is 34.

The square root of 664322551 is about 25774.4553967683. The cubic root of 664322551 is about 872.5553755053. Note that the first 3 decimals are identical.

The spelling of 664322551 in words is "six hundred sixty-four million, three hundred twenty-two thousand, five hundred fifty-one".