646264206620 has 48 divisors (see below), whose sum is σ = 1374809436000. Its totient is φ = 255153085440.

The previous prime is 646264206617. The next prime is 646264206631. The reversal of 646264206620 is 26602462646.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 698456 + ... + 1334304.

It is an arithmetic number, because the mean of its divisors is an integer number (28641863250).

Almost surely, 2^646264206620 is an apocalyptic number.

It is an amenable number.

646264206620 is an abundant number, since it is smaller than the sum of its proper divisors (728545229380).

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

646264206620 is a wasteful number, since it uses less digits than its factorization.

646264206620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636518 (or 636516 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 44.

The spelling of 646264206620 in words is "six hundred forty-six billion, two hundred sixty-four million, two hundred six thousand, six hundred twenty".