18779900831 has 2 divisors, whose sum is σ = 18779900832. Its totient is φ = 18779900830.

The previous prime is 18779900807. The next prime is 18779900837. The reversal of 18779900831 is 13800997781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18779900831 - 2¹⁰ = 18779899807 is a prime.

It is a super-2 number, since 2×18779900831² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18779900837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9389950415 + 9389950416.

It is an arithmetic number, because the mean of its divisors is an integer number (9389950416).

Almost surely, 2^18779900831 is an apocalyptic number.

18779900831 is a deficient number, since it is larger than the sum of its proper divisors (1).

18779900831 is an equidigital number, since it uses as much as digits as its factorization.

18779900831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 762048, while the sum is 53.

The spelling of 18779900831 in words is "eighteen billion, seven hundred seventy-nine million, nine hundred thousand, eight hundred thirty-one".