18168831320 has 32 divisors (see below), whose sum is σ = 43031444400. Its totient is φ = 6885030528.

The previous prime is 18168831293. The next prime is 18168831337. The reversal of 18168831320 is 2313886181.

It is a super-2 number, since 2×18168831320² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11952419 + ... + 11953938.

Almost surely, 2^18168831320 is an apocalyptic number.

18168831320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18168831320 is an abundant number, since it is smaller than the sum of its proper divisors (24862613080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18168831320 is a wasteful number, since it uses less digits than its factorization.

18168831320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23906387 (or 23906383 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 41.

The spelling of 18168831320 in words is "eighteen billion, one hundred sixty-eight million, eight hundred thirty-one thousand, three hundred twenty".