12956781625 has 32 divisors (see below), whose sum is σ = 18022417920. Its totient is φ = 9242208000.

The previous prime is 12956781571. The next prime is 12956781641. The reversal of 12956781625 is 52618765921.

It is a happy number.

It is not a de Polignac number, because 12956781625 - 2¹³ = 12956773433 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 120081 + ... + 200830.

It is an arithmetic number, because the mean of its divisors is an integer number (563200560).

Almost surely, 2^12956781625 is an apocalyptic number.

It is an amenable number.

12956781625 is a deficient number, since it is larger than the sum of its proper divisors (5065636295).

12956781625 is a wasteful number, since it uses less digits than its factorization.

12956781625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320962 (or 320952 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 52.

The spelling of 12956781625 in words is "twelve billion, nine hundred fifty-six million, seven hundred eighty-one thousand, six hundred twenty-five".