18137794968 has 64 divisors (see below), whose sum is σ = 50750604000. Its totient is φ = 6001790976.

The previous prime is 18137794967. The next prime is 18137794973. The reversal of 18137794968 is 86949773181.

18137794968 is a `hidden beast` number, since 1 + 8 + 137 + 7 + 9 + 496 + 8 = 666.

It is a super-2 number, since 2×18137794968² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18137794967) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 276873 + ... + 336056.

Almost surely, 2^18137794968 is an apocalyptic number.

18137794968 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18137794968 is an abundant number, since it is smaller than the sum of its proper divisors (32612809032).

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

18137794968 is a wasteful number, since it uses less digits than its factorization.

18137794968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613081 (or 613071 counting only the distinct ones).

The product of its digits is 18289152, while the sum is 63.

The spelling of 18137794968 in words is "eighteen billion, one hundred thirty-seven million, seven hundred ninety-four thousand, nine hundred sixty-eight".