645634624638572 has 6 divisors (see below), whose sum is σ = 1129860593117508. Its totient is φ = 322817312319284.

The previous prime is 645634624638551. The next prime is 645634624638587. The reversal of 645634624638572 is 275836426436546.

645634624638572 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 645634624638496 and 645634624638505.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80704328079818 + ... + 80704328079825.

It is an arithmetic number, because the mean of its divisors is an integer number (188310098852918).

Almost surely, 2^{645634624638572} is an apocalyptic number.

It is an amenable number.

645634624638572 is a deficient number, since it is larger than the sum of its proper divisors (484225968478936).

645634624638572 is a wasteful number, since it uses less digits than its factorization.

645634624638572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161408656159647 (or 161408656159645 counting only the distinct ones).

The product of its digits is 4180377600, while the sum is 71.

The spelling of 645634624638572 in words is "six hundred forty-five trillion, six hundred thirty-four billion, six hundred twenty-four million, six hundred thirty-eight thousand, five hundred seventy-two".