15686979685 has 24 divisors (see below), whose sum is σ = 21270069504. Its totient is φ = 11080555200.

The previous prime is 15686979647. The next prime is 15686979703. The reversal of 15686979685 is 58697968651.

It is not a de Polignac number, because 15686979685 - 2¹⁷ = 15686848613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 384141 + ... + 423010.

It is an arithmetic number, because the mean of its divisors is an integer number (886252896).

Almost surely, 2^15686979685 is an apocalyptic number.

It is an amenable number.

15686979685 is a deficient number, since it is larger than the sum of its proper divisors (5583089819).

15686979685 is a wasteful number, since it uses less digits than its factorization.

15686979685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807205 (or 807192 counting only the distinct ones).

The product of its digits is 195955200, while the sum is 70.

The spelling of 15686979685 in words is "fifteen billion, six hundred eighty-six million, nine hundred seventy-nine thousand, six hundred eighty-five".