18811372511 has 2 divisors, whose sum is σ = 18811372512. Its totient is φ = 18811372510.

The previous prime is 18811372469. The next prime is 18811372529. The reversal of 18811372511 is 11527311881.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18811372511 - 2¹⁰ = 18811371487 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18811372561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9405686255 + 9405686256.

It is an arithmetic number, because the mean of its divisors is an integer number (9405686256).

Almost surely, 2^18811372511 is an apocalyptic number.

18811372511 is a deficient number, since it is larger than the sum of its proper divisors (1).

18811372511 is an equidigital number, since it uses as much as digits as its factorization.

18811372511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 38.

The spelling of 18811372511 in words is "eighteen billion, eight hundred eleven million, three hundred seventy-two thousand, five hundred eleven".