555666557 has 2 divisors, whose sum is σ = 555666558. Its totient is φ = 555666556.

The previous prime is 555666547. The next prime is 555666569. The reversal of 555666557 is 755666555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 283383556 + 272283001 = 16834^2 + 16501^2 .

It is a cyclic number.

It is not a de Polignac number, because 555666557 - 2¹² = 555662461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (555666547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277833278 + 277833279.

It is an arithmetic number, because the mean of its divisors is an integer number (277833279).

Almost surely, 2^555666557 is an apocalyptic number.

It is an amenable number.

555666557 is a deficient number, since it is larger than the sum of its proper divisors (1).

555666557 is an equidigital number, since it uses as much as digits as its factorization.

555666557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4725000, while the sum is 50.

The square root of 555666557 is about 23572.5806181674. The cubic root of 555666557 is about 822.1254384180.

The spelling of 555666557 in words is "five hundred fifty-five million, six hundred sixty-six thousand, five hundred fifty-seven".