645117928976 has 10 divisors (see below), whose sum is σ = 1249915987422. Its totient is φ = 322558964480.

The previous prime is 645117928967. The next prime is 645117928997. The reversal of 645117928976 is 679829711546.

It can be written as a sum of positive squares in only one way, i.e., 642363778576 + 2754150400 = 801476^2 + 52480^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20159935265 + ... + 20159935296.

Almost surely, 2^645117928976 is an apocalyptic number.

It is an amenable number.

645117928976 is a deficient number, since it is larger than the sum of its proper divisors (604798058446).

645117928976 is a wasteful number, since it uses less digits than its factorization.

645117928976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40319870569 (or 40319870563 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 65.

The spelling of 645117928976 in words is "six hundred forty-five billion, one hundred seventeen million, nine hundred twenty-eight thousand, nine hundred seventy-six".