18040737531 has 4 divisors (see below), whose sum is σ = 24054316712. Its totient is φ = 12027158352.

The previous prime is 18040737529. The next prime is 18040737551. The reversal of 18040737531 is 13573704081.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18040737531 - 2¹ = 18040737529 is a prime.

It is a super-2 number, since 2×18040737531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18040737531.

It is not an unprimeable number, because it can be changed into a prime (18040737511) 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, 3006789586 + ... + 3006789591.

It is an arithmetic number, because the mean of its divisors is an integer number (6013579178).

Almost surely, 2^18040737531 is an apocalyptic number.

18040737531 is a deficient number, since it is larger than the sum of its proper divisors (6013579181).

18040737531 is an equidigital number, since it uses as much as digits as its factorization.

18040737531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6013579180.

The product of its (nonzero) digits is 70560, while the sum is 39.

The spelling of 18040737531 in words is "eighteen billion, forty million, seven hundred thirty-seven thousand, five hundred thirty-one".