18811372811 has 24 divisors (see below), whose sum is σ = 24207221472. Its totient is φ = 14300668800.

The previous prime is 18811372781. The next prime is 18811372843. The reversal of 18811372811 is 11827311881.

It is not a de Polignac number, because 18811372811 - 2¹⁸ = 18811110667 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is not an unprimeable number, because it can be changed into a prime (18811372511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 236120 + ... + 305573.

It is an arithmetic number, because the mean of its divisors is an integer number (1008634228).

Almost surely, 2^18811372811 is an apocalyptic number.

18811372811 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18811372811 is a deficient number, since it is larger than the sum of its proper divisors (5395848661).

18811372811 is a wasteful number, since it uses less digits than its factorization.

18811372811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541763 (or 541752 counting only the distinct ones).

The product of its digits is 21504, while the sum is 41.

The spelling of 18811372811 in words is "eighteen billion, eight hundred eleven million, three hundred seventy-two thousand, eight hundred eleven".