156011561161 has 2 divisors, whose sum is σ = 156011561162. Its totient is φ = 156011561160.

The previous prime is 156011561159. The next prime is 156011561171. The reversal of 156011561161 is 161165110651.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100105796025 + 55905765136 = 316395^2 + 236444^2 .

It is a cyclic number.

It is not a de Polignac number, because 156011561161 - 2¹ = 156011561159 is a prime.

Together with 156011561159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (156011561131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78005780580 + 78005780581.

It is an arithmetic number, because the mean of its divisors is an integer number (78005780581).

Almost surely, 2^156011561161 is an apocalyptic number.

It is an amenable number.

156011561161 is a deficient number, since it is larger than the sum of its proper divisors (1).

156011561161 is an equidigital number, since it uses as much as digits as its factorization.

156011561161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 34.

The spelling of 156011561161 in words is "one hundred fifty-six billion, eleven million, five hundred sixty-one thousand, one hundred sixty-one".