18726138263 has 6 divisors (see below), whose sum is σ = 21783467016. Its totient is φ = 16050975612.

The previous prime is 18726138259. The next prime is 18726138281. The reversal of 18726138263 is 36283162781.

It is not a de Polignac number, because 18726138263 - 2² = 18726138259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18726138283) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 191082995 + ... + 191083092.

It is an arithmetic number, because the mean of its divisors is an integer number (3630577836).

Almost surely, 2^18726138263 is an apocalyptic number.

18726138263 is a deficient number, since it is larger than the sum of its proper divisors (3057328753).

18726138263 is an equidigital number, since it uses as much as digits as its factorization.

18726138263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382166101 (or 382166094 counting only the distinct ones).

The product of its digits is 580608, while the sum is 47.

The spelling of 18726138263 in words is "eighteen billion, seven hundred twenty-six million, one hundred thirty-eight thousand, two hundred sixty-three".