12640525256 has 16 divisors (see below), whose sum is σ = 23842909440. Its totient is φ = 6282416080.

The previous prime is 12640525243. The next prime is 12640525279. The reversal of 12640525256 is 65252504621.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4729400 + ... + 4732071.

It is an arithmetic number, because the mean of its divisors is an integer number (1490181840).

Almost surely, 2^12640525256 is an apocalyptic number.

It is an amenable number.

12640525256 is a deficient number, since it is larger than the sum of its proper divisors (11202384184).

12640525256 is a wasteful number, since it uses less digits than its factorization.

12640525256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9461644 (or 9461640 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 38.

The spelling of 12640525256 in words is "twelve billion, six hundred forty million, five hundred twenty-five thousand, two hundred fifty-six".