115656551561 has 2 divisors, whose sum is σ = 115656551562. Its totient is φ = 115656551560.

The previous prime is 115656551533. The next prime is 115656551587. The reversal of 115656551561 is 165155656511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77726652025 + 37929899536 = 278795^2 + 194756^2 .

It is a cyclic number.

It is not a de Polignac number, because 115656551561 - 2⁶ = 115656551497 is a prime.

It is not a weakly prime, because it can be changed into another prime (115656551161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57828275780 + 57828275781.

It is an arithmetic number, because the mean of its divisors is an integer number (57828275781).

Almost surely, 2^115656551561 is an apocalyptic number.

It is an amenable number.

115656551561 is a deficient number, since it is larger than the sum of its proper divisors (1).

115656551561 is an equidigital number, since it uses as much as digits as its factorization.

115656551561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 675000, while the sum is 47.

The spelling of 115656551561 in words is "one hundred fifteen billion, six hundred fifty-six million, five hundred fifty-one thousand, five hundred sixty-one".