12309617985 has 32 divisors (see below), whose sum is σ = 23058024192. Its totient is φ = 5490001920.

The previous prime is 12309617923. The next prime is 12309617993. The reversal of 12309617985 is 58971690321.

It is not a de Polignac number, because 12309617985 - 2¹⁵ = 12309585217 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1425384 + ... + 1433993.

It is an arithmetic number, because the mean of its divisors is an integer number (720563256).

Almost surely, 2^12309617985 is an apocalyptic number.

12309617985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12309617985 is a deficient number, since it is larger than the sum of its proper divisors (10748406207).

12309617985 is a wasteful number, since it uses less digits than its factorization.

12309617985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2859433.

The product of its (nonzero) digits is 816480, while the sum is 51.

The spelling of 12309617985 in words is "twelve billion, three hundred nine million, six hundred seventeen thousand, nine hundred eighty-five".