118109731657 has 2 divisors, whose sum is σ = 118109731658. Its totient is φ = 118109731656.

The previous prime is 118109731639. The next prime is 118109731667. The reversal of 118109731657 is 756137901811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91141194816 + 26968536841 = 301896^2 + 164221^2 .

It is an emirp because it is prime and its reverse (756137901811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 118109731657 - 2⁷ = 118109731529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 118109731657.

It is not a weakly prime, because it can be changed into another prime (118109731667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 59054865828 + 59054865829.

It is an arithmetic number, because the mean of its divisors is an integer number (59054865829).

Almost surely, 2^118109731657 is an apocalyptic number.

It is an amenable number.

118109731657 is a deficient number, since it is larger than the sum of its proper divisors (1).

118109731657 is an equidigital number, since it uses as much as digits as its factorization.

118109731657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 317520, while the sum is 49.

The spelling of 118109731657 in words is "one hundred eighteen billion, one hundred nine million, seven hundred thirty-one thousand, six hundred fifty-seven".