21616061650155 has 24 divisors (see below), whose sum is σ = 42820388793312. Its totient is φ = 9881628182784.

The previous prime is 21616061650103. The next prime is 21616061650193. The reversal of 21616061650155 is 55105616061612.

21616061650155 is a `hidden beast` number, since 2 + 1 + 6 + 16 + 0 + 616 + 5 + 0 + 15 + 5 = 666.

It is not a de Polignac number, because 21616061650155 - 2¹⁸ = 21616061388011 is a prime.

It is a super-2 number, since 2×21616061650155² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 21616061650155.

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 23 ways as a sum of consecutive naturals, for example, 34311208654 + ... + 34311209283.

It is an arithmetic number, because the mean of its divisors is an integer number (1784182866388).

Almost surely, 2^{21616061650155} is an apocalyptic number.

21616061650155 is a deficient number, since it is larger than the sum of its proper divisors (21204327143157).

21616061650155 is a wasteful number, since it uses less digits than its factorization.

21616061650155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68622417955 (or 68622417952 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 45.

The spelling of 21616061650155 in words is "twenty-one trillion, six hundred sixteen billion, sixty-one million, six hundred fifty thousand, one hundred fifty-five".