640762160512 has 32 divisors (see below), whose sum is σ = 1295570896920. Its totient is φ = 315599268864.

The previous prime is 640762160509. The next prime is 640762160527. The reversal of 640762160512 is 215061267046.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×640762160512² (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 3 ways as a sum of consecutive naturals, for example, 37349293 + ... + 37366444.

Almost surely, 2^640762160512 is an apocalyptic number.

It is an amenable number.

640762160512 is an abundant number, since it is smaller than the sum of its proper divisors (654808736408).

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

640762160512 is an equidigital number, since it uses as much as digits as its factorization.

640762160512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74715818 (or 74715806 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 640762160512 in words is "six hundred forty billion, seven hundred sixty-two million, one hundred sixty thousand, five hundred twelve".