2156205601161 has 12 divisors (see below), whose sum is σ = 3142081319988. Its totient is φ = 1424749423104.

The previous prime is 2156205601153. The next prime is 2156205601271. The reversal of 2156205601161 is 1611065026512.

2156205601161 is a `hidden beast` number, since 2 + 1 + 5 + 6 + 20 + 560 + 11 + 61 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1146090149136 + 1010115452025 = 1070556^2 + 1005045^2 .

It is not a de Polignac number, because 2156205601161 - 2³ = 2156205601153 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (2156205601141) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1060080400 + ... + 1060082433.

It is an arithmetic number, because the mean of its divisors is an integer number (261840109999).

Almost surely, 2^{2156205601161} is an apocalyptic number.

It is an amenable number.

2156205601161 is a deficient number, since it is larger than the sum of its proper divisors (985875718827).

2156205601161 is a wasteful number, since it uses less digits than its factorization.

2156205601161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120162952 (or 2120162949 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The spelling of 2156205601161 in words is "two trillion, one hundred fifty-six billion, two hundred five million, six hundred one thousand, one hundred sixty-one".