12565575677 has 4 divisors (see below), whose sum is σ = 12998871420. Its totient is φ = 12132279936.

The previous prime is 12565575647. The next prime is 12565575703. The reversal of 12565575677 is 77657556521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77657556521 = 127 ⋅611476823.

It can be written as a sum of positive squares in 2 ways, for example, as 9052761316 + 3512814361 = 95146^2 + 59269^2 .

It is a cyclic number.

It is not a de Polignac number, because 12565575677 - 2²² = 12561381373 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 (12565575637) 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, 216647828 + ... + 216647885.

It is an arithmetic number, because the mean of its divisors is an integer number (3249717855).

Almost surely, 2^12565575677 is an apocalyptic number.

It is an amenable number.

12565575677 is a deficient number, since it is larger than the sum of its proper divisors (433295743).

12565575677 is an equidigital number, since it uses as much as digits as its factorization.

12565575677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433295742.

The product of its digits is 15435000, while the sum is 56.

The spelling of 12565575677 in words is "twelve billion, five hundred sixty-five million, five hundred seventy-five thousand, six hundred seventy-seven".