557666 has 8 divisors (see below), whose sum is σ = 852444. Its totient is φ = 273520.

The previous prime is 557663. The next prime is 557671. The reversal of 557666 is 666755.

It can be written as a sum of positive squares in 2 ways, for example, as 525625 + 32041 = 725^2 + 179^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (557663) 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, 2525 + ... + 2736.

2⁵⁵⁷⁶⁶⁶ is an apocalyptic number.

557666 is a deficient number, since it is larger than the sum of its proper divisors (294778).

557666 is a wasteful number, since it uses less digits than its factorization.

557666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5316.

The product of its digits is 37800, while the sum is 35.

The square root of 557666 is about 746.7703797018. The cubic root of 557666 is about 82.3110336799.

The spelling of 557666 in words is "five hundred fifty-seven thousand, six hundred sixty-six".