12663256591 has 8 divisors (see below), whose sum is σ = 13338122480. Its totient is φ = 11989228608.

The previous prime is 12663256583. The next prime is 12663256601. The reversal of 12663256591 is 19565236621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12663256591 - 2³ = 12663256583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12663256511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178326 + ... + 239011.

It is an arithmetic number, because the mean of its divisors is an integer number (1667265310).

Almost surely, 2^12663256591 is an apocalyptic number.

12663256591 is a deficient number, since it is larger than the sum of its proper divisors (674865889).

12663256591 is a wasteful number, since it uses less digits than its factorization.

12663256591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418953.

The product of its digits is 583200, while the sum is 46.

The spelling of 12663256591 in words is "twelve billion, six hundred sixty-three million, two hundred fifty-six thousand, five hundred ninety-one".