645244506504 has 96 divisors (see below), whose sum is σ = 1896329635200. Its totient is φ = 197021185920.

The previous prime is 645244506493. The next prime is 645244506583. The reversal of 645244506504 is 405605442546.

645244506504 is a `hidden beast` number, since 6 + 4 + 52 + 44 + 50 + 6 + 504 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 645244506504.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2508544 + ... + 2753775.

It is an arithmetic number, because the mean of its divisors is an integer number (19753433700).

Almost surely, 2^645244506504 is an apocalyptic number.

It is an amenable number.

645244506504 is an abundant number, since it is smaller than the sum of its proper divisors (1251085128696).

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

645244506504 is a wasteful number, since it uses less digits than its factorization.

645244506504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5262475 (or 5262468 counting only the distinct ones).

The product of its (nonzero) digits is 2304000, while the sum is 45.

The spelling of 645244506504 in words is "six hundred forty-five billion, two hundred forty-four million, five hundred six thousand, five hundred four".