645358622120 has 32 divisors (see below), whose sum is σ = 1456013491200. Its totient is φ = 257440054848.

The previous prime is 645358622099. The next prime is 645358622131. The reversal of 645358622120 is 21226853546.

It is a super-2 number, since 2×645358622120² (a number of 24 digits) contains 22 as substring.

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, 21966200 + ... + 21995559.

It is an arithmetic number, because the mean of its divisors is an integer number (45500421600).

Almost surely, 2^645358622120 is an apocalyptic number.

It is an amenable number.

645358622120 is an abundant number, since it is smaller than the sum of its proper divisors (810654869080).

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

645358622120 is a wasteful number, since it uses less digits than its factorization.

645358622120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43962137 (or 43962133 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 44.

The spelling of 645358622120 in words is "six hundred forty-five billion, three hundred fifty-eight million, six hundred twenty-two thousand, one hundred twenty".