12566052557 has 2 divisors, whose sum is σ = 12566052558. Its totient is φ = 12566052556.

The previous prime is 12566052547. The next prime is 12566052559. The reversal of 12566052557 is 75525066521.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9973817161 + 2592235396 = 99869^2 + 50914^2 .

It is an emirp because it is prime and its reverse (75525066521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12566052557 - 2¹² = 12566048461 is a prime.

Together with 12566052559, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12566052559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6283026278 + 6283026279.

It is an arithmetic number, because the mean of its divisors is an integer number (6283026279).

Almost surely, 2^12566052557 is an apocalyptic number.

It is an amenable number.

12566052557 is a deficient number, since it is larger than the sum of its proper divisors (1).

12566052557 is an equidigital number, since it uses as much as digits as its factorization.

12566052557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 630000, while the sum is 44.

The spelling of 12566052557 in words is "twelve billion, five hundred sixty-six million, fifty-two thousand, five hundred fifty-seven".