18372727231 has 2 divisors, whose sum is σ = 18372727232. Its totient is φ = 18372727230.

The previous prime is 18372727213. The next prime is 18372727273. The reversal of 18372727231 is 13272727381.

Together with previous prime (18372727213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18372727231 - 2¹¹ = 18372725183 is a prime.

It is a super-2 number, since 2×18372727231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18372727531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9186363615 + 9186363616.

It is an arithmetic number, because the mean of its divisors is an integer number (9186363616).

Almost surely, 2^18372727231 is an apocalyptic number.

18372727231 is a deficient number, since it is larger than the sum of its proper divisors (1).

18372727231 is an equidigital number, since it uses as much as digits as its factorization.

18372727231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 197568, while the sum is 43.

The spelling of 18372727231 in words is "eighteen billion, three hundred seventy-two million, seven hundred twenty-seven thousand, two hundred thirty-one".