12691808927 has 16 divisors (see below), whose sum is σ = 14674024512. Its totient is φ = 10752168960.

The previous prime is 12691808923. The next prime is 12691808947. The reversal of 12691808927 is 72980819621.

It is a cyclic number.

It is not a de Polignac number, because 12691808927 - 2² = 12691808923 is a prime.

It is a super-2 number, since 2×12691808927² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12691808923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 512777 + ... + 536957.

It is an arithmetic number, because the mean of its divisors is an integer number (917126532).

Almost surely, 2^12691808927 is an apocalyptic number.

12691808927 is a deficient number, since it is larger than the sum of its proper divisors (1982215585).

12691808927 is an equidigital number, since it uses as much as digits as its factorization.

12691808927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25058.

The product of its (nonzero) digits is 870912, while the sum is 53.

The spelling of 12691808927 in words is "twelve billion, six hundred ninety-one million, eight hundred eight thousand, nine hundred twenty-seven".