979999999985 has 4 divisors (see below), whose sum is σ = 1175999999988. Its totient is φ = 783999999984.

The previous prime is 979999999919. The next prime is 980000000009. The reversal of 979999999985 is 589999999979.

979999999985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 164621701696 + 815378298289 = 405736^2 + 902983^2 .

It is a cyclic number.

It is not a de Polignac number, because 979999999985 - 2⁸ = 979999999729 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97999999994 + ... + 98000000003.

It is an arithmetic number, because the mean of its divisors is an integer number (293999999997).

Almost surely, 2^979999999985 is an apocalyptic number.

It is an amenable number.

979999999985 is a deficient number, since it is larger than the sum of its proper divisors (196000000003).

979999999985 is a wasteful number, since it uses less digits than its factorization.

979999999985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196000000002.

The product of its digits is 108477736920, while the sum is 101.

The spelling of 979999999985 in words is "nine hundred seventy-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-five".