664403699232 has 1536 divisors, whose sum is σ = 2574028800000. Its totient is φ = 165480247296.

The previous prime is 664403699177. The next prime is 664403699263. The reversal of 664403699232 is 232996304466.

664403699232 is a `hidden beast` number, since 6 + 6 + 4 + 40 + 369 + 9 + 232 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 8410173369 + ... + 8410173447.

It is an arithmetic number, because the mean of its divisors is an integer number (1675800000).

Almost surely, 2^664403699232 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 664403699232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1287014400000).

664403699232 is an abundant number, since it is smaller than the sum of its proper divisors (1909625100768).

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

664403699232 is a wasteful number, since it uses less digits than its factorization.

664403699232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 54.

The spelling of 664403699232 in words is "six hundred sixty-four billion, four hundred three million, six hundred ninety-nine thousand, two hundred thirty-two".