18726716231 has 4 divisors (see below), whose sum is σ = 19828287792. Its totient is φ = 17625144672.

The previous prime is 18726716227. The next prime is 18726716233. The reversal of 18726716231 is 13261762781.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13261762781 = 17 ⋅780103693.

It is not a de Polignac number, because 18726716231 - 2² = 18726716227 is a prime.

It is a super-2 number, since 2×18726716231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18726716233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550785755 + ... + 550785788.

It is an arithmetic number, because the mean of its divisors is an integer number (4957071948).

Almost surely, 2^18726716231 is an apocalyptic number.

18726716231 is a deficient number, since it is larger than the sum of its proper divisors (1101571561).

18726716231 is a wasteful number, since it uses less digits than its factorization.

18726716231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101571560.

The product of its digits is 169344, while the sum is 44.

The spelling of 18726716231 in words is "eighteen billion, seven hundred twenty-six million, seven hundred sixteen thousand, two hundred thirty-one".