640310164656 has 40 divisors (see below), whose sum is σ = 1654187939184. Its totient is φ = 213429838080.

The previous prime is 640310164591. The next prime is 640310164657. The reversal of 640310164656 is 656461013046.

640310164656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (640310164657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1416286 + ... + 1812866.

Almost surely, 2^640310164656 is an apocalyptic number.

It is an amenable number.

640310164656 is an abundant number, since it is smaller than the sum of its proper divisors (1013877774528).

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

640310164656 is a wasteful number, since it uses less digits than its factorization.

640310164656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430229 (or 430223 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

The spelling of 640310164656 in words is "six hundred forty billion, three hundred ten million, one hundred sixty-four thousand, six hundred fifty-six".