55538186661 has 6 divisors (see below), whose sum is σ = 80221825190. Its totient is φ = 37025457768.

The previous prime is 55538186647. The next prime is 55538186677. The reversal of 55538186661 is 16668183555.

It can be written as a sum of positive squares in only one way, i.e., 55333152900 + 205033761 = 235230^2 + 14319^2 .

It is not a de Polignac number, because 55538186661 - 2¹¹ = 55538184613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55538186598 and 55538186607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55538181661) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3085454806 + ... + 3085454823.

Almost surely, 2^55538186661 is an apocalyptic number.

It is an amenable number.

55538186661 is a deficient number, since it is larger than the sum of its proper divisors (24683638529).

55538186661 is a wasteful number, since it uses less digits than its factorization.

55538186661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6170909635 (or 6170909632 counting only the distinct ones).

The product of its digits is 5184000, while the sum is 54.

The spelling of 55538186661 in words is "fifty-five billion, five hundred thirty-eight million, one hundred eighty-six thousand, six hundred sixty-one".