55566144166555 has 24 divisors (see below), whose sum is σ = 73362745310400. Its totient is φ = 40372845912960.

The previous prime is 55566144166523. The next prime is 55566144166573.

55566144166555 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 55566144166555 - 2⁵ = 55566144166523 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 43570090 + ... + 44827279.

It is an arithmetic number, because the mean of its divisors is an integer number (3056781054600).

Almost surely, 2^{55566144166555} is an apocalyptic number.

55566144166555 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55566144166555 is a deficient number, since it is larger than the sum of its proper divisors (17796601143845).

55566144166555 is a wasteful number, since it uses less digits than its factorization.

55566144166555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88398435 (or 88398424 counting only the distinct ones).

The product of its digits is 324000000, while the sum is 64.

The spelling of 55566144166555 in words is "fifty-five trillion, five hundred sixty-six billion, one hundred forty-four million, one hundred sixty-six thousand, five hundred fifty-five".