19886163397 has 4 divisors (see below), whose sum is σ = 19928746656. Its totient is φ = 19843580140.

The previous prime is 19886163383. The next prime is 19886163413. The reversal of 19886163397 is 79336168891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19886163397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19886163317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21290929 + ... + 21291862.

It is an arithmetic number, because the mean of its divisors is an integer number (4982186664).

Almost surely, 2^19886163397 is an apocalyptic number.

It is an amenable number.

19886163397 is a deficient number, since it is larger than the sum of its proper divisors (42583259).

19886163397 is an equidigital number, since it uses as much as digits as its factorization.

19886163397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42583258.

The product of its digits is 11757312, while the sum is 61.

The spelling of 19886163397 in words is "nineteen billion, eight hundred eighty-six million, one hundred sixty-three thousand, three hundred ninety-seven".