556161557 has 4 divisors (see below), whose sum is σ = 635613216. Its totient is φ = 476709900.

The previous prime is 556161517. The next prime is 556161587. The reversal of 556161557 is 755161655.

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 a cyclic number.

It is not a de Polignac number, because 556161557 - 2⁶ = 556161493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556161517) 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, 39725819 + ... + 39725832.

It is an arithmetic number, because the mean of its divisors is an integer number (158903304).

Almost surely, 2^556161557 is an apocalyptic number.

It is an amenable number.

556161557 is a deficient number, since it is larger than the sum of its proper divisors (79451659).

556161557 is an equidigital number, since it uses as much as digits as its factorization.

556161557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79451658.

The product of its digits is 157500, while the sum is 41.

The square root of 556161557 is about 23583.0777677554. The cubic root of 556161557 is about 822.3694884428.

The spelling of 556161557 in words is "five hundred fifty-six million, one hundred sixty-one thousand, five hundred fifty-seven".