12956813583 has 96 divisors (see below), whose sum is σ = 22303434240. Its totient is φ = 6639494400.

The previous prime is 12956813579. The next prime is 12956813603. The reversal of 12956813583 is 38531865921.

It is a happy number.

It is a Cunningham number, because it is equal to 113828²-1.

It is not a de Polignac number, because 12956813583 - 2² = 12956813579 is a prime.

It is a super-2 number, since 2×12956813583² (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 (12956813183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6487141 + ... + 6489137.

It is an arithmetic number, because the mean of its divisors is an integer number (232327440).

Almost surely, 2^12956813583 is an apocalyptic number.

12956813583 is a deficient number, since it is larger than the sum of its proper divisors (9346620657).

12956813583 is a wasteful number, since it uses less digits than its factorization.

12956813583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2157 (or 2150 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 51.

The spelling of 12956813583 in words is "twelve billion, nine hundred fifty-six million, eight hundred thirteen thousand, five hundred eighty-three".