645415634656 has 72 divisors (see below), whose sum is σ = 1456860885984. Its totient is φ = 280361502720.

The previous prime is 645415634623. The next prime is 645415634657. The reversal of 645415634656 is 656436514546.

It is a super-2 number, since 2×645415634656² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645415634597 and 645415634606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645415634657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3418200 + ... + 3602071.

It is an arithmetic number, because the mean of its divisors is an integer number (20234178972).

Almost surely, 2^645415634656 is an apocalyptic number.

It is an amenable number.

645415634656 is an abundant number, since it is smaller than the sum of its proper divisors (811445251328).

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

645415634656 is a wasteful number, since it uses less digits than its factorization.

645415634656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7020324 (or 7020303 counting only the distinct ones).

The product of its digits is 31104000, while the sum is 55.

The spelling of 645415634656 in words is "six hundred forty-five billion, four hundred fifteen million, six hundred thirty-four thousand, six hundred fifty-six".