557566661677 has 2 divisors, whose sum is σ = 557566661678. Its totient is φ = 557566661676.

The previous prime is 557566661653. The next prime is 557566661681. The reversal of 557566661677 is 776166665755.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 446670335556 + 110896326121 = 668334^2 + 333011^2 .

It is a cyclic number.

It is not a de Polignac number, because 557566661677 - 2¹⁵ = 557566628909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (557566668677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278783330838 + 278783330839.

It is an arithmetic number, because the mean of its divisors is an integer number (278783330839).

Almost surely, 2^557566661677 is an apocalyptic number.

It is an amenable number.

557566661677 is a deficient number, since it is larger than the sum of its proper divisors (1).

557566661677 is an equidigital number, since it uses as much as digits as its factorization.

557566661677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 333396000, while the sum is 67.

The spelling of 557566661677 in words is "five hundred fifty-seven billion, five hundred sixty-six million, six hundred sixty-one thousand, six hundred seventy-seven".