18263931377 has 2 divisors, whose sum is σ = 18263931378. Its totient is φ = 18263931376.

The previous prime is 18263931349. The next prime is 18263931391. The reversal of 18263931377 is 77313936281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17400511921 + 863419456 = 131911^2 + 29384^2 .

It is an emirp because it is prime and its reverse (77313936281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18263931377 - 2⁸ = 18263931121 is a prime.

It is a super-2 number, since 2×18263931377² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18263931337) 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, 9131965688 + 9131965689.

It is an arithmetic number, because the mean of its divisors is an integer number (9131965689).

Almost surely, 2^18263931377 is an apocalyptic number.

It is an amenable number.

18263931377 is a deficient number, since it is larger than the sum of its proper divisors (1).

18263931377 is an equidigital number, since it uses as much as digits as its factorization.

18263931377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 50.

The spelling of 18263931377 in words is "eighteen billion, two hundred sixty-three million, nine hundred thirty-one thousand, three hundred seventy-seven".