645571622732 has 24 divisors (see below), whose sum is σ = 1189241617200. Its totient is φ = 305789181696.

The previous prime is 645571622719. The next prime is 645571622741. The reversal of 645571622732 is 237226175546.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3726944 + ... + 3896312.

It is an arithmetic number, because the mean of its divisors is an integer number (49551734050).

Almost surely, 2^645571622732 is an apocalyptic number.

It is an amenable number.

645571622732 is a deficient number, since it is larger than the sum of its proper divisors (543669994468).

645571622732 is a wasteful number, since it uses less digits than its factorization.

645571622732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219545 (or 219543 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 50.

The spelling of 645571622732 in words is "six hundred forty-five billion, five hundred seventy-one million, six hundred twenty-two thousand, seven hundred thirty-two".