55566555 has 16 divisors (see below), whose sum is σ = 96989184. Its totient is φ = 26941280.

The previous prime is 55566509. The next prime is 55566559.

55566555 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 55566555 - 2⁸ = 55566299 is a prime.

It is a Smith number, since the sum of its digits (42) 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 (55566559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168219 + ... + 168548.

It is an arithmetic number, because the mean of its divisors is an integer number (6061824).

Almost surely, 2^55566555 is an apocalyptic number.

55566555 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55566555 is a deficient number, since it is larger than the sum of its proper divisors (41422629).

55566555 is a wasteful number, since it uses less digits than its factorization.

55566555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336786.

The product of its digits is 562500, while the sum is 42.

The square root of 55566555 is about 7454.2977536452. The cubic root of 55566555 is about 381.5965949641.

The spelling of 55566555 in words is "fifty-five million, five hundred sixty-six thousand, five hundred fifty-five".