115718378121 has 12 divisors (see below), whose sum is σ = 171666303172. Its totient is φ = 75060569376.

The previous prime is 115718378099. The next prime is 115718378161. The reversal of 115718378121 is 121873817511.

115718378121 is a `hidden beast` number, since 1 + 1 + 571 + 8 + 3 + 78 + 1 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 107243150400 + 8475227721 = 327480^2 + 92061^2 .

It is not a de Polignac number, because 115718378121 - 2⁹ = 115718377609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (115718378161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 173750986 + ... + 173751651.

Almost surely, 2^115718378121 is an apocalyptic number.

It is an amenable number.

115718378121 is a deficient number, since it is larger than the sum of its proper divisors (55947925051).

115718378121 is a wasteful number, since it uses less digits than its factorization.

115718378121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347502680 (or 347502677 counting only the distinct ones).

The product of its digits is 94080, while the sum is 45.

The spelling of 115718378121 in words is "one hundred fifteen billion, seven hundred eighteen million, three hundred seventy-eight thousand, one hundred twenty-one".