115658716981 has 4 divisors (see below), whose sum is σ = 116327264652. Its totient is φ = 114990169312.

The previous prime is 115658716973. The next prime is 115658717089. The reversal of 115658716981 is 189617856511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 79744676881 + 35914040100 = 282391^2 + 189510^2 .

It is a cyclic number.

It is not a de Polignac number, because 115658716981 - 2³ = 115658716973 is a prime.

It is a super-2 number, since 2×115658716981² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115658716931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 334273576 + ... + 334273921.

It is an arithmetic number, because the mean of its divisors is an integer number (29081816163).

Almost surely, 2^115658716981 is an apocalyptic number.

It is an amenable number.

115658716981 is a deficient number, since it is larger than the sum of its proper divisors (668547671).

115658716981 is an equidigital number, since it uses as much as digits as its factorization.

115658716981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668547670.

The product of its digits is 3628800, while the sum is 58.

The spelling of 115658716981 in words is "one hundred fifteen billion, six hundred fifty-eight million, seven hundred sixteen thousand, nine hundred eighty-one".