55666555 has 16 divisors (see below), whose sum is σ = 79663104. Its totient is φ = 36511200.

The previous prime is 55666543. The next prime is 55666577. The reversal of 55666555 is 55566655.

It is not a de Polignac number, because 55666555 - 2⁷ = 55666427 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33771 + ... + 35380.

It is an arithmetic number, because the mean of its divisors is an integer number (4978944).

Almost surely, 2^55666555 is an apocalyptic number.

55666555 is a deficient number, since it is larger than the sum of its proper divisors (23996549).

55666555 is a wasteful number, since it uses less digits than its factorization.

55666555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69186.

The product of its digits is 675000, while the sum is 43.

The square root of 55666555 is about 7461.0022785146. The cubic root of 55666555 is about 381.8253704154.

It can be divided in two parts, 5566 and 6555, that added together give a palindrome (12121).

The spelling of 55666555 in words is "fifty-five million, six hundred sixty-six thousand, five hundred fifty-five".