12690431985 has 64 divisors (see below), whose sum is σ = 25442611200. Its totient is φ = 5247348480.

The previous prime is 12690431917. The next prime is 12690432019. The reversal of 12690431985 is 58913409621.

It is not a de Polignac number, because 12690431985 - 2⁸ = 12690431729 is a prime.

It is a super-2 number, since 2×12690431985² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 202239 + ... + 257451.

It is an arithmetic number, because the mean of its divisors is an integer number (397540800).

Almost surely, 2^12690431985 is an apocalyptic number.

12690431985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12690431985 is an abundant number, since it is smaller than the sum of its proper divisors (12752179215).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12690431985 is a wasteful number, since it uses less digits than its factorization.

12690431985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55438.

The product of its (nonzero) digits is 466560, while the sum is 48.

The spelling of 12690431985 in words is "twelve billion, six hundred ninety million, four hundred thirty-one thousand, nine hundred eighty-five".