12565256623 has 2 divisors, whose sum is σ = 12565256624. Its totient is φ = 12565256622.

The previous prime is 12565256621. The next prime is 12565256657. The reversal of 12565256623 is 32665256521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12565256623 - 2¹ = 12565256621 is a prime.

Together with 12565256621, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 12565256623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12565256621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6282628311 + 6282628312.

It is an arithmetic number, because the mean of its divisors is an integer number (6282628312).

Almost surely, 2^12565256623 is an apocalyptic number.

12565256623 is a deficient number, since it is larger than the sum of its proper divisors (1).

12565256623 is an equidigital number, since it uses as much as digits as its factorization.

12565256623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648000, while the sum is 43.

The spelling of 12565256623 in words is "twelve billion, five hundred sixty-five million, two hundred fifty-six thousand, six hundred twenty-three".