646480218895 has 12 divisors (see below), whose sum is σ = 902433612024. Its totient is φ = 443300721360.

The previous prime is 646480218851. The next prime is 646480218931. The reversal of 646480218895 is 598812084646.

It is not a de Polignac number, because 646480218895 - 2²⁵ = 646446664463 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 1319347141 + ... + 1319347630.

It is an arithmetic number, because the mean of its divisors is an integer number (75202801002).

Almost surely, 2^646480218895 is an apocalyptic number.

646480218895 is a deficient number, since it is larger than the sum of its proper divisors (255953393129).

646480218895 is a wasteful number, since it uses less digits than its factorization.

646480218895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2638694790 (or 2638694783 counting only the distinct ones).

The product of its (nonzero) digits is 26542080, while the sum is 61.

The spelling of 646480218895 in words is "six hundred forty-six billion, four hundred eighty million, two hundred eighteen thousand, eight hundred ninety-five".