55166191 has 2 divisors, whose sum is σ = 55166192. Its totient is φ = 55166190.

The previous prime is 55166179. The next prime is 55166227. The reversal of 55166191 is 19166155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55166191 - 2¹⁵ = 55133423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55166141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27583095 + 27583096.

It is an arithmetic number, because the mean of its divisors is an integer number (27583096).

Almost surely, 2^55166191 is an apocalyptic number.

55166191 is a deficient number, since it is larger than the sum of its proper divisors (1).

55166191 is an equidigital number, since it uses as much as digits as its factorization.

55166191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8100, while the sum is 34.

The square root of 55166191 is about 7427.3946306898. The cubic root of 55166191 is about 380.6779012037.

The spelling of 55166191 in words is "fifty-five million, one hundred sixty-six thousand, one hundred ninety-one".