55561166 has 4 divisors (see below), whose sum is σ = 83341752. Its totient is φ = 27780582.

The previous prime is 55561159. The next prime is 55561171. The reversal of 55561166 is 66116555.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13890290 + ... + 13890293.

It is an arithmetic number, because the mean of its divisors is an integer number (20835438).

Almost surely, 2^55561166 is an apocalyptic number.

55561166 is a deficient number, since it is larger than the sum of its proper divisors (27780586).

55561166 is a wasteful number, since it uses less digits than its factorization.

55561166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27780585.

The product of its digits is 27000, while the sum is 35.

The square root of 55561166 is about 7453.9362755527. The cubic root of 55561166 is about 381.5842584634.

The spelling of 55561166 in words is "fifty-five million, five hundred sixty-one thousand, one hundred sixty-six".