646504250656 has 72 divisors (see below), whose sum is σ = 1414754098380. Its totient is φ = 290563553280.

The previous prime is 646504250653. The next prime is 646504250723. The reversal of 646504250656 is 656052405646.

646504250656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 501145063056 + 145359187600 = 707916^2 + 381260^2 .

It is a super-2 number, since 2×646504250656² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (646504250653) 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, 593421 + ... + 1282636.

Almost surely, 2^646504250656 is an apocalyptic number.

It is an amenable number.

646504250656 is an abundant number, since it is smaller than the sum of its proper divisors (768249847724).

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

646504250656 is a wasteful number, since it uses less digits than its factorization.

646504250656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1876178 (or 1876159 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 49.

The spelling of 646504250656 in words is "six hundred forty-six billion, five hundred four million, two hundred fifty thousand, six hundred fifty-six".