556128557 has 4 divisors (see below), whose sum is σ = 556215036. Its totient is φ = 556042080.

The previous prime is 556128553. The next prime is 556128571. The reversal of 556128557 is 755821655.

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

It can be written as a sum of positive squares in 2 ways, for example, as 224670121 + 331458436 = 14989^2 + 18206^2 .

It is a cyclic number.

It is not a de Polignac number, because 556128557 - 2² = 556128553 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556128553) 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, 32744 + ... + 46737.

It is an arithmetic number, because the mean of its divisors is an integer number (139053759).

Almost surely, 2^556128557 is an apocalyptic number.

It is an amenable number.

556128557 is a deficient number, since it is larger than the sum of its proper divisors (86479).

556128557 is an equidigital number, since it uses as much as digits as its factorization.

556128557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86478.

The product of its digits is 420000, while the sum is 44.

The square root of 556128557 is about 23582.3781031515. The cubic root of 556128557 is about 822.3532229473.

The spelling of 556128557 in words is "five hundred fifty-six million, one hundred twenty-eight thousand, five hundred fifty-seven".