12640256555 has 16 divisors (see below), whose sum is σ = 15330056544. Its totient is φ = 10004524800.

The previous prime is 12640256537. The next prime is 12640256561. The reversal of 12640256555 is 55565204621.

It is not a de Polignac number, because 12640256555 - 2⁶ = 12640256491 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 714932 + ... + 732398.

It is an arithmetic number, because the mean of its divisors is an integer number (958128534).

Almost surely, 2^12640256555 is an apocalyptic number.

12640256555 is a deficient number, since it is larger than the sum of its proper divisors (2689799989).

12640256555 is a wasteful number, since it uses less digits than its factorization.

12640256555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19006.

The product of its (nonzero) digits is 360000, while the sum is 41.

The spelling of 12640256555 in words is "twelve billion, six hundred forty million, two hundred fifty-six thousand, five hundred fifty-five".