21163542611166 has 96 divisors (see below), whose sum is σ = 48742109095680. Its totient is φ = 6627713500800.

The previous prime is 21163542611147. The next prime is 21163542611173. The reversal of 21163542611166 is 66111624536112.

21163542611166 is a `hidden beast` number, since 2 + 1 + 1 + 63 + 5 + 426 + 1 + 1 + 166 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2443396 + ... + 6949623.

It is an arithmetic number, because the mean of its divisors is an integer number (507730303080).

Almost surely, 2^{21163542611166} is an apocalyptic number.

21163542611166 is an abundant number, since it is smaller than the sum of its proper divisors (27578566484514).

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

21163542611166 is a wasteful number, since it uses less digits than its factorization.

21163542611166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9393182 (or 9393179 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The spelling of 21163542611166 in words is "twenty-one trillion, one hundred sixty-three billion, five hundred forty-two million, six hundred eleven thousand, one hundred sixty-six".