12585779999 has 6 divisors (see below), whose sum is σ = 13628389176. Its totient is φ = 11617642920.

The previous prime is 12585779957. The next prime is 12585780019. The reversal of 12585779999 is 99997758521.

It is a de Polignac number, because none of the positive numbers 2^k-12585779999 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 (12585779299) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37235867 + ... + 37236204.

It is an arithmetic number, because the mean of its divisors is an integer number (2271398196).

Almost surely, 2^12585779999 is an apocalyptic number.

12585779999 is a deficient number, since it is larger than the sum of its proper divisors (1042609177).

12585779999 is an equidigital number, since it uses as much as digits as its factorization.

12585779999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74472097 (or 74472084 counting only the distinct ones).

The product of its digits is 128595600, while the sum is 71.

The spelling of 12585779999 in words is "twelve billion, five hundred eighty-five million, seven hundred seventy-nine thousand, nine hundred ninety-nine".