18512259377 has 2 divisors, whose sum is σ = 18512259378. Its totient is φ = 18512259376.

The previous prime is 18512259349. The next prime is 18512259383. The reversal of 18512259377 is 77395221581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16011359296 + 2500900081 = 126536^2 + 50009^2 .

It is a cyclic number.

It is not a de Polignac number, because 18512259377 - 2⁸ = 18512259121 is a prime.

It is not a weakly prime, because it can be changed into another prime (18512259307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9256129688 + 9256129689.

It is an arithmetic number, because the mean of its divisors is an integer number (9256129689).

Almost surely, 2^18512259377 is an apocalyptic number.

It is an amenable number.

18512259377 is a deficient number, since it is larger than the sum of its proper divisors (1).

18512259377 is an equidigital number, since it uses as much as digits as its factorization.

18512259377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1058400, while the sum is 50.

The spelling of 18512259377 in words is "eighteen billion, five hundred twelve million, two hundred fifty-nine thousand, three hundred seventy-seven".