12557606557 has 4 divisors (see below), whose sum is σ = 12560806620. Its totient is φ = 12554406496.

The previous prime is 12557606489. The next prime is 12557606561. The reversal of 12557606557 is 75560675521.

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

It can be written as a sum of positive squares in 2 ways, for example, as 733001476 + 11824605081 = 27074^2 + 108741^2 .

It is a cyclic number.

It is not a de Polignac number, because 12557606557 - 2¹⁹ = 12557082269 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12557606557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12557606857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1594138 + ... + 1601995.

It is an arithmetic number, because the mean of its divisors is an integer number (3140201655).

Almost surely, 2^12557606557 is an apocalyptic number.

It is an amenable number.

12557606557 is a deficient number, since it is larger than the sum of its proper divisors (3200063).

12557606557 is an equidigital number, since it uses as much as digits as its factorization.

12557606557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3200062.

The product of its (nonzero) digits is 2205000, while the sum is 49.

The spelling of 12557606557 in words is "twelve billion, five hundred fifty-seven million, six hundred six thousand, five hundred fifty-seven".