12664672557 has 4 divisors (see below), whose sum is σ = 16886230080. Its totient is φ = 8443115036.

The previous prime is 12664672487. The next prime is 12664672571. The reversal of 12664672557 is 75527646621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12664672557 - 2⁷ = 12664672429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12664672577) 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, 2110778757 + ... + 2110778762.

It is an arithmetic number, because the mean of its divisors is an integer number (4221557520).

Almost surely, 2^12664672557 is an apocalyptic number.

It is an amenable number.

12664672557 is a deficient number, since it is larger than the sum of its proper divisors (4221557523).

12664672557 is an equidigital number, since it uses as much as digits as its factorization.

12664672557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4221557522.

The product of its digits is 4233600, while the sum is 51.

The spelling of 12664672557 in words is "twelve billion, six hundred sixty-four million, six hundred seventy-two thousand, five hundred fifty-seven".