12656620259 has 4 divisors (see below), whose sum is σ = 12657183504. Its totient is φ = 12656057016.

The previous prime is 12656620253. The next prime is 12656620267. The reversal of 12656620259 is 95202665621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12656620259 - 2⁴ = 12656620243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12656620253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246452 + ... + 293345.

It is an arithmetic number, because the mean of its divisors is an integer number (3164295876).

Almost surely, 2^12656620259 is an apocalyptic number.

12656620259 is a deficient number, since it is larger than the sum of its proper divisors (563245).

12656620259 is an equidigital number, since it uses as much as digits as its factorization.

12656620259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563244.

The product of its (nonzero) digits is 388800, while the sum is 44.

The spelling of 12656620259 in words is "twelve billion, six hundred fifty-six million, six hundred twenty thousand, two hundred fifty-nine".