15668972858579 has 4 divisors (see below), whose sum is σ = 15670221693384. Its totient is φ = 15667724023776.

The previous prime is 15668972858519. The next prime is 15668972858597. The reversal of 15668972858579 is 97585827986651.

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

It is a cyclic number.

It is not a de Polignac number, because 15668972858579 - 2²⁰ = 15668971810003 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15668972858579.

It is not an unprimeable number, because it can be changed into a prime (15668972858519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624398582 + ... + 624423675.

It is an arithmetic number, because the mean of its divisors is an integer number (3917555423346).

Almost surely, 2^{15668972858579} is an apocalyptic number.

15668972858579 is a deficient number, since it is larger than the sum of its proper divisors (1248834805).

15668972858579 is a wasteful number, since it uses less digits than its factorization.

15668972858579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248834804.

The product of its digits is 18289152000, while the sum is 86.

The spelling of 15668972858579 in words is "fifteen trillion, six hundred sixty-eight billion, nine hundred seventy-two million, eight hundred fifty-eight thousand, five hundred seventy-nine".