19713897018 has 16 divisors (see below), whose sum is σ = 43808660160. Its totient is φ = 6571298988.

The previous prime is 19713896989. The next prime is 19713897019. The reversal of 19713897018 is 81079831791.

19713897018 is a `hidden beast` number, since 197 + 1 + 389 + 70 + 1 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 365072167 = 19713897018 / (1 + 9 + 7 + 1 + 3 + 8 + 9 + 7 + 0 + 1 + 8).

It is not an unprimeable number, because it can be changed into a prime (19713897019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182536030 + ... + 182536137.

It is an arithmetic number, because the mean of its divisors is an integer number (2738041260).

Almost surely, 2^19713897018 is an apocalyptic number.

19713897018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19713897018 is an abundant number, since it is smaller than the sum of its proper divisors (24094763142).

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

19713897018 is a wasteful number, since it uses less digits than its factorization.

19713897018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365072178 (or 365072172 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 54.

The spelling of 19713897018 in words is "nineteen billion, seven hundred thirteen million, eight hundred ninety-seven thousand, eighteen".