555663606366555 has 24 divisors (see below), whose sum is σ = 985549094086128. Its totient is φ = 289461971687616.

The previous prime is 555663606366553. The next prime is 555663606366587.

555663606366555 is a `hidden beast` number, since 5 + 5 + 5 + 6 + 6 + 3 + 6 + 0 + 6 + 3 + 66 + 555 = 666.

555663606366555 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 555663606366555 - 2¹ = 555663606366553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (555663606366553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 143582325292 + ... + 143582329161.

It is an arithmetic number, because the mean of its divisors is an integer number (41064545586922).

Almost surely, 2^{555663606366555} is an apocalyptic number.

555663606366555 is a deficient number, since it is larger than the sum of its proper divisors (429885487719573).

555663606366555 is a wasteful number, since it uses less digits than its factorization.

555663606366555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287164654507 (or 287164654504 counting only the distinct ones).

The product of its (nonzero) digits is 6561000000, while the sum is 72.

The spelling of 555663606366555 in words is "five hundred fifty-five trillion, six hundred sixty-three billion, six hundred six million, three hundred sixty-six thousand, five hundred fifty-five".