557998666 has 4 divisors (see below), whose sum is σ = 836998002. Its totient is φ = 278999332.

The previous prime is 557998663. The next prime is 557998673. The reversal of 557998666 is 666899755.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 556724025 + 1274641 = 23595^2 + 1129^2 .

It is a super-2 number, since 2×557998666² = 622725022515559112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (557998663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139499665 + ... + 139499668.

Almost surely, 2^557998666 is an apocalyptic number.

557998666 is a deficient number, since it is larger than the sum of its proper divisors (278999336).

557998666 is a wasteful number, since it uses less digits than its factorization.

557998666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278999335.

The product of its digits is 24494400, while the sum is 61.

The square root of 557998666 is about 23621.9953856570. The cubic root of 557998666 is about 823.2739750060.

The spelling of 557998666 in words is "five hundred fifty-seven million, nine hundred ninety-eight thousand, six hundred sixty-six".