645415040264 has 32 divisors (see below), whose sum is σ = 1217729700000. Its totient is φ = 320689539072.

The previous prime is 645415040243. The next prime is 645415040297. The reversal of 645415040264 is 462040514546.

645415040264 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1996232 + ... + 2296904.

It is an arithmetic number, because the mean of its divisors is an integer number (38054053125).

Almost surely, 2^645415040264 is an apocalyptic number.

It is an amenable number.

645415040264 is a deficient number, since it is larger than the sum of its proper divisors (572314659736).

645415040264 is a wasteful number, since it uses less digits than its factorization.

645415040264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302357 (or 302353 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 41.

The spelling of 645415040264 in words is "six hundred forty-five billion, four hundred fifteen million, forty thousand, two hundred sixty-four".