15985693229979 has 32 divisors (see below), whose sum is σ = 23380141720320. Its totient is φ = 9634943001600.

The previous prime is 15985693229971. The next prime is 15985693230029. The reversal of 15985693229979 is 97992239658951.

It is a happy number.

15985693229979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15985693229979 - 2³ = 15985693229971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15985693229971) 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, 8145967 + ... + 9916055.

It is an arithmetic number, because the mean of its divisors is an integer number (730629428760).

Almost surely, 2^{15985693229979} is an apocalyptic number.

15985693229979 is a deficient number, since it is larger than the sum of its proper divisors (7394448490341).

15985693229979 is a wasteful number, since it uses less digits than its factorization.

15985693229979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1771611.

The product of its digits is 5952139200, while the sum is 84.

The spelling of 15985693229979 in words is "fifteen trillion, nine hundred eighty-five billion, six hundred ninety-three million, two hundred twenty-nine thousand, nine hundred seventy-nine".