18357116977 has 2 divisors, whose sum is σ = 18357116978. Its totient is φ = 18357116976.

The previous prime is 18357116929. The next prime is 18357117017. The reversal of 18357116977 is 77961175381.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15126786081 + 3230330896 = 122991^2 + 56836^2 .

It is a cyclic number.

It is not a de Polignac number, because 18357116977 - 2⁷ = 18357116849 is a prime.

It is not a weakly prime, because it can be changed into another prime (18357416977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9178558488 + 9178558489.

It is an arithmetic number, because the mean of its divisors is an integer number (9178558489).

Almost surely, 2^18357116977 is an apocalyptic number.

It is an amenable number.

18357116977 is a deficient number, since it is larger than the sum of its proper divisors (1).

18357116977 is an equidigital number, since it uses as much as digits as its factorization.

18357116977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2222640, while the sum is 55.

The spelling of 18357116977 in words is "eighteen billion, three hundred fifty-seven million, one hundred sixteen thousand, nine hundred seventy-seven".