115155512340721 has 2 divisors, whose sum is σ = 115155512340722. Its totient is φ = 115155512340720.

The previous prime is 115155512340647. The next prime is 115155512340773. The reversal of 115155512340721 is 127043215551511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113155448877025 + 2000063463696 = 10637455^2 + 1414236^2 .

It is a cyclic number.

It is not a de Polignac number, because 115155512340721 - 2⁷ = 115155512340593 is a prime.

It is not a weakly prime, because it can be changed into another prime (115155512440721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 57577756170360 + 57577756170361.

It is an arithmetic number, because the mean of its divisors is an integer number (57577756170361).

Almost surely, 2^{115155512340721} is an apocalyptic number.

It is an amenable number.

115155512340721 is a deficient number, since it is larger than the sum of its proper divisors (1).

115155512340721 is an equidigital number, since it uses as much as digits as its factorization.

115155512340721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 210000, while the sum is 43.

The spelling of 115155512340721 in words is "one hundred fifteen trillion, one hundred fifty-five billion, five hundred twelve million, three hundred forty thousand, seven hundred twenty-one".