18263931337 has 2 divisors, whose sum is σ = 18263931338. Its totient is φ = 18263931336.

The previous prime is 18263931253. The next prime is 18263931349. The reversal of 18263931337 is 73313936281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16276911561 + 1987019776 = 127581^2 + 44576^2 .

It is a cyclic number.

It is not a de Polignac number, because 18263931337 - 2⁷ = 18263931209 is a prime.

It is not a weakly prime, because it can be changed into another prime (18263931377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9131965668 + 9131965669.

It is an arithmetic number, because the mean of its divisors is an integer number (9131965669).

Almost surely, 2^18263931337 is an apocalyptic number.

It is an amenable number.

18263931337 is a deficient number, since it is larger than the sum of its proper divisors (1).

18263931337 is an equidigital number, since it uses as much as digits as its factorization.

18263931337 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 46.

The spelling of 18263931337 in words is "eighteen billion, two hundred sixty-three million, nine hundred thirty-one thousand, three hundred thirty-seven".