664445501607756 has 48 divisors (see below), whose sum is σ = 1703483562049920. Its totient is φ = 199898581249920.

The previous prime is 664445501607749. The next prime is 664445501607773. The reversal of 664445501607756 is 657706105544466.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18106737201 + ... + 18106773896.

It is an arithmetic number, because the mean of its divisors is an integer number (35489240876040).

Almost surely, 2^{664445501607756} is an apocalyptic number.

664445501607756 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

664445501607756 is an abundant number, since it is smaller than the sum of its proper divisors (1039038060442164).

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

664445501607756 is a wasteful number, since it uses less digits than its factorization.

664445501607756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36213511254 (or 36213511252 counting only the distinct ones).

The product of its (nonzero) digits is 508032000, while the sum is 66.

The spelling of 664445501607756 in words is "six hundred sixty-four trillion, four hundred forty-five billion, five hundred one million, six hundred seven thousand, seven hundred fifty-six".