645576115852840 has 64 divisors (see below), whose sum is σ = 1508931601873920. Its totient is φ = 248383802688000.

The previous prime is 645576115852831. The next prime is 645576115852859. The reversal of 645576115852840 is 48258511675546.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2772024216 + ... + 2772257095.

It is an arithmetic number, because the mean of its divisors is an integer number (23577056279280).

Almost surely, 2^{645576115852840} is an apocalyptic number.

It is an amenable number.

645576115852840 is an abundant number, since it is smaller than the sum of its proper divisors (863355486021080).

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

645576115852840 is a wasteful number, since it uses less digits than its factorization.

645576115852840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5544281434 (or 5544281430 counting only the distinct ones).

The product of its (nonzero) digits is 322560000, while the sum is 67.

The spelling of 645576115852840 in words is "six hundred forty-five trillion, five hundred seventy-six billion, one hundred fifteen million, eight hundred fifty-two thousand, eight hundred forty".