18400068531 has 12 divisors (see below), whose sum is σ = 28622329008. Its totient is φ = 11323119024.

The previous prime is 18400068529. The next prime is 18400068539. The reversal of 18400068531 is 13586000481.

It is not a de Polignac number, because 18400068531 - 2¹ = 18400068529 is a prime.

It is a super-2 number, since 2×18400068531² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18400068539) 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 in 11 ways as a sum of consecutive naturals, for example, 78632655 + ... + 78632888.

It is an arithmetic number, because the mean of its divisors is an integer number (2385194084).

Almost surely, 2^18400068531 is an apocalyptic number.

18400068531 is a deficient number, since it is larger than the sum of its proper divisors (10222260477).

18400068531 is a wasteful number, since it uses less digits than its factorization.

18400068531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157265562 (or 157265559 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The spelling of 18400068531 in words is "eighteen billion, four hundred million, sixty-eight thousand, five hundred thirty-one".