12956978377 has 16 divisors (see below), whose sum is σ = 15379384320. Its totient is φ = 10685436048.

The previous prime is 12956978371. The next prime is 12956978393. The reversal of 12956978377 is 77387965921.

It is not a de Polignac number, because 12956978377 - 2³ = 12956978369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12956978371) 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, 314343 + ... + 353164.

It is an arithmetic number, because the mean of its divisors is an integer number (961211520).

Almost surely, 2^12956978377 is an apocalyptic number.

It is an amenable number.

12956978377 is a deficient number, since it is larger than the sum of its proper divisors (2422405943).

12956978377 is an equidigital number, since it uses as much as digits as its factorization.

12956978377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 667620.

The product of its digits is 40007520, while the sum is 64.

The spelling of 12956978377 in words is "twelve billion, nine hundred fifty-six million, nine hundred seventy-eight thousand, three hundred seventy-seven".