161136631161 has 12 divisors (see below), whose sum is σ = 253912267440. Its totient is φ = 97658564280.

The previous prime is 161136631157. The next prime is 161136631181.

161136631161 is a `hidden beast` number, since 1 + 6 + 1 + 1 + 3 + 6 + 631 + 16 + 1 = 666.

161136631161 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 161136631161 - 2² = 161136631157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161136631181) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 813821271 + ... + 813821468.

It is an arithmetic number, because the mean of its divisors is an integer number (21159355620).

Almost surely, 2^161136631161 is an apocalyptic number.

161136631161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161136631161 is a deficient number, since it is larger than the sum of its proper divisors (92775636279).

161136631161 is a wasteful number, since it uses less digits than its factorization.

161136631161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1627642756 (or 1627642753 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

It can be divided in two parts, 161136 and 631161, that added together give a palindrome (792297).

The spelling of 161136631161 in words is "one hundred sixty-one billion, one hundred thirty-six million, six hundred thirty-one thousand, one hundred sixty-one".