21664102613546 has 16 divisors (see below), whose sum is σ = 32659878888000. Its totient is φ = 10777477743648.

The previous prime is 21664102613501. The next prime is 21664102613557. The reversal of 21664102613546 is 64531620146612.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21664102613546.

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, 34300721 + ... + 34926603.

It is an arithmetic number, because the mean of its divisors is an integer number (2041242430500).

Almost surely, 2^{21664102613546} is an apocalyptic number.

21664102613546 is a deficient number, since it is larger than the sum of its proper divisors (10995776274454).

21664102613546 is a wasteful number, since it uses less digits than its factorization.

21664102613546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713053.

The product of its (nonzero) digits is 1244160, while the sum is 47.

The spelling of 21664102613546 in words is "twenty-one trillion, six hundred sixty-four billion, one hundred two million, six hundred thirteen thousand, five hundred forty-six".