21663514025756 has 24 divisors (see below), whose sum is σ = 39929661402960. Its totient is φ = 10255701859200.

The previous prime is 21663514025687. The next prime is 21663514025771. The reversal of 21663514025756 is 65752041536612.

It is a junction number, because it is equal to n+sod(n) for n = 21663514025698 and 21663514025707.

It is a congruent number.

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, 82683335 + ... + 82944926.

It is an arithmetic number, because the mean of its divisors is an integer number (1663735891790).

Almost surely, 2^{21663514025756} is an apocalyptic number.

It is an amenable number.

21663514025756 is a deficient number, since it is larger than the sum of its proper divisors (18266147377204).

21663514025756 is a wasteful number, since it uses less digits than its factorization.

21663514025756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165630005 (or 165630003 counting only the distinct ones).

The product of its (nonzero) digits is 9072000, while the sum is 53.

The spelling of 21663514025756 in words is "twenty-one trillion, six hundred sixty-three billion, five hundred fourteen million, twenty-five thousand, seven hundred fifty-six".