55666555101 has 10 divisors (see below), whose sum is σ = 83156212062. Its totient is φ = 37111036680.

The previous prime is 55666555099. The next prime is 55666555141. The reversal of 55666555101 is 10155566655.

It can be written as a sum of positive squares in only one way, i.e., 30249905625 + 25416649476 = 173925^2 + 159426^2 .

It is not a de Polignac number, because 55666555101 - 2¹ = 55666555099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55666555141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 343620630 + ... + 343620791.

Almost surely, 2^55666555101 is an apocalyptic number.

It is an amenable number.

55666555101 is a deficient number, since it is larger than the sum of its proper divisors (27489656961).

55666555101 is an equidigital number, since it uses as much as digits as its factorization.

55666555101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687241433 (or 687241424 counting only the distinct ones).

The product of its (nonzero) digits is 675000, while the sum is 45.

The spelling of 55666555101 in words is "fifty-five billion, six hundred sixty-six million, five hundred fifty-five thousand, one hundred one".