645798990024 has 64 divisors (see below), whose sum is σ = 1794139113600. Its totient is φ = 215235966528.

The previous prime is 645798990007. The next prime is 645798990037. The reversal of 645798990024 is 420099897546.

645798990024 is a `hidden beast` number, since 6 + 457 + 98 + 9 + 90 + 0 + 2 + 4 = 666.

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, 1350757 + ... + 1765259.

It is an arithmetic number, because the mean of its divisors is an integer number (28033423650).

Almost surely, 2^645798990024 is an apocalyptic number.

It is an amenable number.

645798990024 is an abundant number, since it is smaller than the sum of its proper divisors (1148340123576).

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

645798990024 is a wasteful number, since it uses less digits than its factorization.

645798990024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421731 (or 421721 counting only the distinct ones).

The product of its (nonzero) digits is 39191040, while the sum is 63.

The spelling of 645798990024 in words is "six hundred forty-five billion, seven hundred ninety-eight million, nine hundred ninety thousand, twenty-four".