12956856599 has 4 divisors (see below), whose sum is σ = 13638796440. Its totient is φ = 12274916760.

The previous prime is 12956856589. The next prime is 12956856641. The reversal of 12956856599 is 99565865921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99565865921 = 691 ⋅144089531.

It is a cyclic number.

It is not a de Polignac number, because 12956856599 - 2⁸ = 12956856343 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 (12956856529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 340969892 + ... + 340969929.

It is an arithmetic number, because the mean of its divisors is an integer number (3409699110).

Almost surely, 2^12956856599 is an apocalyptic number.

12956856599 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

12956856599 is a deficient number, since it is larger than the sum of its proper divisors (681939841).

12956856599 is an equidigital number, since it uses as much as digits as its factorization.

12956856599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681939840.

The product of its digits is 52488000, while the sum is 65.

The spelling of 12956856599 in words is "twelve billion, nine hundred fifty-six million, eight hundred fifty-six thousand, five hundred ninety-nine".