131507664161 has 2 divisors, whose sum is σ = 131507664162. Its totient is φ = 131507664160.

The previous prime is 131507664157. The next prime is 131507664191. The reversal of 131507664161 is 161466705131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103700100625 + 27807563536 = 322025^2 + 166756^2 .

It is a cyclic number.

It is not a de Polignac number, because 131507664161 - 2² = 131507664157 is a prime.

It is not a weakly prime, because it can be changed into another prime (131507664191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65753832080 + 65753832081.

It is an arithmetic number, because the mean of its divisors is an integer number (65753832081).

Almost surely, 2^131507664161 is an apocalyptic number.

It is an amenable number.

131507664161 is a deficient number, since it is larger than the sum of its proper divisors (1).

131507664161 is an equidigital number, since it uses as much as digits as its factorization.

131507664161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 131507664161 in words is "one hundred thirty-one billion, five hundred seven million, six hundred sixty-four thousand, one hundred sixty-one".