556111111 has 8 divisors (see below), whose sum is σ = 562857984. Its totient is φ = 549390360.

The previous prime is 556111093. The next prime is 556111117. The reversal of 556111111 is 111111655.

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

It is a cyclic number.

It is not a de Polignac number, because 556111111 - 2⁵ = 556111079 is a prime.

It is a Duffinian number.

556111111 is a modest number, since divided by 11111 gives 5561 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556111117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38130 + ... + 50656.

It is an arithmetic number, because the mean of its divisors is an integer number (70357248).

Almost surely, 2^556111111 is an apocalyptic number.

556111111 is a deficient number, since it is larger than the sum of its proper divisors (6746873).

556111111 is a wasteful number, since it uses less digits than its factorization.

556111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13061.

The product of its digits is 150, while the sum is 22.

The square root of 556111111 is about 23582.0082054095. The cubic root of 556111111 is about 822.3446236621.

Adding to 556111111 its reverse (111111655), we get a palindrome (667222766).

It can be divided in two parts, 556 and 111111, that multiplied together give a palindrome (61777716).

The spelling of 556111111 in words is "five hundred fifty-six million, one hundred eleven thousand, one hundred eleven".