12655856639 has 2 divisors, whose sum is σ = 12655856640. Its totient is φ = 12655856638.

The previous prime is 12655856617. The next prime is 12655856657. The reversal of 12655856639 is 93665855621.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12655856639 - 2⁸ = 12655856383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12655859639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6327928319 + 6327928320.

It is an arithmetic number, because the mean of its divisors is an integer number (6327928320).

Almost surely, 2^12655856639 is an apocalyptic number.

12655856639 is a deficient number, since it is larger than the sum of its proper divisors (1).

12655856639 is an equidigital number, since it uses as much as digits as its factorization.

12655856639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664000, while the sum is 56.

The spelling of 12655856639 in words is "twelve billion, six hundred fifty-five million, eight hundred fifty-six thousand, six hundred thirty-nine".