18000723331 has 2 divisors, whose sum is σ = 18000723332. Its totient is φ = 18000723330.

The previous prime is 18000723277. The next prime is 18000723337. The reversal of 18000723331 is 13332700081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18000723331 - 2²⁷ = 17866505603 is a prime.

It is a super-2 number, since 2×18000723331² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18000723331.

It is not a weakly prime, because it can be changed into another prime (18000723337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9000361665 + 9000361666.

It is an arithmetic number, because the mean of its divisors is an integer number (9000361666).

Almost surely, 2^18000723331 is an apocalyptic number.

18000723331 is a deficient number, since it is larger than the sum of its proper divisors (1).

18000723331 is an equidigital number, since it uses as much as digits as its factorization.

18000723331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 28.

The spelling of 18000723331 in words is "eighteen billion, seven hundred twenty-three thousand, three hundred thirty-one".