646410916882 has 16 divisors (see below), whose sum is σ = 991426767192. Its totient is φ = 315978732160.

The previous prime is 646410916867. The next prime is 646410916913. The reversal of 646410916882 is 288619014646.

It can be written as a sum of positive squares in 4 ways, for example, as 599879681361 + 46531235521 = 774519^2 + 215711^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10821133 + ... + 10880704.

Almost surely, 2^646410916882 is an apocalyptic number.

646410916882 is a deficient number, since it is larger than the sum of its proper divisors (345015850310).

646410916882 is a wasteful number, since it uses less digits than its factorization.

646410916882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21702173.

The product of its (nonzero) digits is 3981312, while the sum is 55.

The spelling of 646410916882 in words is "six hundred forty-six billion, four hundred ten million, nine hundred sixteen thousand, eight hundred eighty-two".