19886125517 has 4 divisors (see below), whose sum is σ = 19889425596. Its totient is φ = 19882825440.

The previous prime is 19886125507. The next prime is 19886125529. The reversal of 19886125517 is 71552168891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1817657956 + 18068467561 = 42634^2 + 134419^2 .

It is a cyclic number.

It is not a de Polignac number, because 19886125517 - 2¹⁶ = 19886059981 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 (19886125507) 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, 1640984 + ... + 1653057.

It is an arithmetic number, because the mean of its divisors is an integer number (4972356399).

Almost surely, 2^19886125517 is an apocalyptic number.

It is an amenable number.

19886125517 is a deficient number, since it is larger than the sum of its proper divisors (3300079).

19886125517 is an equidigital number, since it uses as much as digits as its factorization.

19886125517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3300078.

The product of its digits is 1209600, while the sum is 53.

The spelling of 19886125517 in words is "nineteen billion, eight hundred eighty-six million, one hundred twenty-five thousand, five hundred seventeen".