640632154765000 has 80 divisors (see below), whose sum is σ = 1501037458804620. Its totient is φ = 256246661280000.

The previous prime is 640632154764869. The next prime is 640632154765091. The reversal of 640632154765000 is 567451236046.

It can be written as a sum of positive squares in 10 ways, for example, as 177074323204 + 640455080441796 = 420802^2 + 25307214^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 207935790 + ... + 210994210.

Almost surely, 2^{640632154765000} is an apocalyptic number.

It is an amenable number.

640632154765000 is an abundant number, since it is smaller than the sum of its proper divisors (860405304039620).

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

640632154765000 is a wasteful number, since it uses less digits than its factorization.

640632154765000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3100340 (or 3100321 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 49.

The spelling of 640632154765000 in words is "six hundred forty trillion, six hundred thirty-two billion, one hundred fifty-four million, seven hundred sixty-five thousand".