664860876885 has 96 divisors (see below), whose sum is σ = 1181995701120. Its totient is φ = 345624827904.

The previous prime is 664860876821. The next prime is 664860876923. The reversal of 664860876885 is 588678068466.

It is a happy number.

664860876885 is a `hidden beast` number, since 6 + 6 + 4 + 8 + 608 + 7 + 6 + 8 + 8 + 5 = 666.

664860876885 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 664860876885 - 2⁶ = 664860876821 is a prime.

It is a super-2 number, since 2×664860876885² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 160631146 + ... + 160635284.

It is an arithmetic number, because the mean of its divisors is an integer number (12312455220).

Almost surely, 2^664860876885 is an apocalyptic number.

It is an amenable number.

664860876885 is a deficient number, since it is larger than the sum of its proper divisors (517134824235).

664860876885 is a wasteful number, since it uses less digits than its factorization.

664860876885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4787 (or 4784 counting only the distinct ones).

The product of its (nonzero) digits is 743178240, while the sum is 72.

The spelling of 664860876885 in words is "six hundred sixty-four billion, eight hundred sixty million, eight hundred seventy-six thousand, eight hundred eighty-five".