19688638697 has 32 divisors (see below), whose sum is σ = 25193548800. Its totient is φ = 15283719360.

The previous prime is 19688638691. The next prime is 19688638699. The reversal of 19688638697 is 79683688691.

It is not a de Polignac number, because 19688638697 - 2¹⁸ = 19688376553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 19688638697.

It is not an unprimeable number, because it can be changed into a prime (19688638691) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 194672 + ... + 277982.

It is an arithmetic number, because the mean of its divisors is an integer number (787298400).

Almost surely, 2^19688638697 is an apocalyptic number.

It is an amenable number.

19688638697 is a deficient number, since it is larger than the sum of its proper divisors (5504910103).

19688638697 is an equidigital number, since it uses as much as digits as its factorization.

19688638697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83398 (or 83384 counting only the distinct ones).

The product of its digits is 188116992, while the sum is 71.

The spelling of 19688638697 in words is "nineteen billion, six hundred eighty-eight million, six hundred thirty-eight thousand, six hundred ninety-seven".