557516217 has 4 divisors (see below), whose sum is σ = 743354960. Its totient is φ = 371677476.

The previous prime is 557516177. The next prime is 557516249. The reversal of 557516217 is 712615755.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 557516217 - 2²⁰ = 556467641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (557516317) 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, 92919367 + ... + 92919372.

It is an arithmetic number, because the mean of its divisors is an integer number (185838740).

Almost surely, 2^557516217 is an apocalyptic number.

It is an amenable number.

557516217 is a deficient number, since it is larger than the sum of its proper divisors (185838743).

557516217 is a wasteful number, since it uses less digits than its factorization.

557516217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185838742.

The product of its digits is 73500, while the sum is 39.

The square root of 557516217 is about 23611.7813178083. The cubic root of 557516217 is about 823.0366373829.

The spelling of 557516217 in words is "five hundred fifty-seven million, five hundred sixteen thousand, two hundred seventeen".