646801561504 has 24 divisors (see below), whose sum is σ = 1455303513888. Its totient is φ = 277200669120.

The previous prime is 646801561501. The next prime is 646801561517. The reversal of 646801561504 is 405165108646.

It is not an unprimeable number, because it can be changed into a prime (646801561501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1443753262 + ... + 1443753709.

It is an arithmetic number, because the mean of its divisors is an integer number (60637646412).

Almost surely, 2^646801561504 is an apocalyptic number.

It is an amenable number.

646801561504 is an abundant number, since it is smaller than the sum of its proper divisors (808501952384).

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

646801561504 is a wasteful number, since it uses less digits than its factorization.

646801561504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2887506988 (or 2887506980 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 46.

The spelling of 646801561504 in words is "six hundred forty-six billion, eight hundred one million, five hundred sixty-one thousand, five hundred four".