18311723226 has 12 divisors (see below), whose sum is σ = 39675400362. Its totient is φ = 6103907736.

The previous prime is 18311723207. The next prime is 18311723231. The reversal of 18311723226 is 62232711381.

18311723226 is a `hidden beast` number, since 18 + 311 + 7 + 2 + 322 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 11014292601 + 7297430625 = 104949^2 + 85425^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 508658961 + ... + 508658996.

Almost surely, 2^18311723226 is an apocalyptic number.

18311723226 is an abundant number, since it is smaller than the sum of its proper divisors (21363677136).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18311723226 is a wasteful number, since it uses less digits than its factorization.

18311723226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017317965 (or 1017317962 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The spelling of 18311723226 in words is "eighteen billion, three hundred eleven million, seven hundred twenty-three thousand, two hundred twenty-six".