555666555 has 32 divisors (see below), whose sum is σ = 917227584. Its totient is φ = 287041536.

The previous prime is 555666547. The next prime is 555666557.

555666555 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 555666555 - 2³ = 555666547 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (555666557) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 127167 + ... + 131463.

It is an arithmetic number, because the mean of its divisors is an integer number (28663362).

Almost surely, 2^555666555 is an apocalyptic number.

555666555 is a deficient number, since it is larger than the sum of its proper divisors (361561029).

555666555 is a wasteful number, since it uses less digits than its factorization.

555666555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4575.

The product of its digits is 3375000, while the sum is 48.

The square root of 555666555 is about 23572.5805757452. The cubic root of 555666555 is about 822.1254374316.

The spelling of 555666555 in words is "five hundred fifty-five million, six hundred sixty-six thousand, five hundred fifty-five".