18397395768 has 64 divisors (see below), whose sum is σ = 46877184000. Its totient is φ = 6015727872.

The previous prime is 18397395761. The next prime is 18397395773. The reversal of 18397395768 is 86759379381.

It is a Cunningham number, because it is equal to 135637²-1.

Its product of digits (68584320) is a multiple of the sum of its prime divisors (68040).

It is a junction number, because it is equal to n+sod(n) for n = 18397395699 and 18397395708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18397395761) 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, 237363 + ... + 305181.

It is an arithmetic number, because the mean of its divisors is an integer number (732456000).

Almost surely, 2^18397395768 is an apocalyptic number.

It is an amenable number.

18397395768 is an abundant number, since it is smaller than the sum of its proper divisors (28479788232).

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

18397395768 is a wasteful number, since it uses less digits than its factorization.

18397395768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68044 (or 68040 counting only the distinct ones).

The product of its digits is 68584320, while the sum is 66.

The spelling of 18397395768 in words is "eighteen billion, three hundred ninety-seven million, three hundred ninety-five thousand, seven hundred sixty-eight".