55566599566555 has 64 divisors (see below), whose sum is σ = 88025754765312. Its totient is φ = 32600540067840.

The previous prime is 55566599566519. The next prime is 55566599566571.

55566599566555 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 55566599566555 - 2⁷ = 55566599566427 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 367995682 + ... + 368146648.

It is an arithmetic number, because the mean of its divisors is an integer number (1375402418208).

Almost surely, 2^{55566599566555} is an apocalyptic number.

55566599566555 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55566599566555 is a deficient number, since it is larger than the sum of its proper divisors (32459155198757).

55566599566555 is a wasteful number, since it uses less digits than its factorization.

55566599566555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207244.

The product of its digits is 41006250000, while the sum is 82.

The spelling of 55566599566555 in words is "fifty-five trillion, five hundred sixty-six billion, five hundred ninety-nine million, five hundred sixty-six thousand, five hundred fifty-five".