21615545046664 has 32 divisors (see below), whose sum is σ = 40567863974400. Its totient is φ = 10797452043840.

The previous prime is 21615545046653. The next prime is 21615545046703. The reversal of 21615545046664 is 46664054551612.

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 7 ways as a sum of consecutive naturals, for example, 42808114 + ... + 43310110.

It is an arithmetic number, because the mean of its divisors is an integer number (1267745749200).

Almost surely, 2^{21615545046664} is an apocalyptic number.

It is an amenable number.

21615545046664 is a deficient number, since it is larger than the sum of its proper divisors (18952318927736).

21615545046664 is a wasteful number, since it uses less digits than its factorization.

21615545046664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507133 (or 507129 counting only the distinct ones).

The product of its (nonzero) digits is 20736000, while the sum is 55.

The spelling of 21615545046664 in words is "twenty-one trillion, six hundred fifteen billion, five hundred forty-five million, forty-six thousand, six hundred sixty-four".