115617599861 has 2 divisors, whose sum is σ = 115617599862. Its totient is φ = 115617599860.

The previous prime is 115617599857. The next prime is 115617600019. The reversal of 115617599861 is 168995716511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74720222500 + 40897377361 = 273350^2 + 202231^2 .

It is a cyclic number.

It is not a de Polignac number, because 115617599861 - 2² = 115617599857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 115617599861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (115617598861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57808799930 + 57808799931.

It is an arithmetic number, because the mean of its divisors is an integer number (57808799931).

Almost surely, 2^115617599861 is an apocalyptic number.

It is an amenable number.

115617599861 is a deficient number, since it is larger than the sum of its proper divisors (1).

115617599861 is an equidigital number, since it uses as much as digits as its factorization.

115617599861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4082400, while the sum is 59.

The spelling of 115617599861 in words is "one hundred fifteen billion, six hundred seventeen million, five hundred ninety-nine thousand, eight hundred sixty-one".