18399837311 has 2 divisors, whose sum is σ = 18399837312. Its totient is φ = 18399837310.

The previous prime is 18399837271. The next prime is 18399837331. The reversal of 18399837311 is 11373899381.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18399837311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18399837331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9199918655 + 9199918656.

It is an arithmetic number, because the mean of its divisors is an integer number (9199918656).

Almost surely, 2^18399837311 is an apocalyptic number.

18399837311 is a deficient number, since it is larger than the sum of its proper divisors (1).

18399837311 is an equidigital number, since it uses as much as digits as its factorization.

18399837311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 53.

The spelling of 18399837311 in words is "eighteen billion, three hundred ninety-nine million, eight hundred thirty-seven thousand, three hundred eleven".