55366191 has 12 divisors (see below), whose sum is σ = 82731480. Its totient is φ = 35637840.

The previous prime is 55366183. The next prime is 55366231. The reversal of 55366191 is 19166355.

55366191 is a `hidden beast` number, since 5 + 5 + 36 + 619 + 1 = 666.

It is not a de Polignac number, because 55366191 - 2³ = 55366183 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55366111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105805 + ... + 106326.

It is an arithmetic number, because the mean of its divisors is an integer number (6894290).

Almost surely, 2^55366191 is an apocalyptic number.

55366191 is a deficient number, since it is larger than the sum of its proper divisors (27365289).

55366191 is a wasteful number, since it uses less digits than its factorization.

55366191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212166 (or 212163 counting only the distinct ones).

The product of its digits is 24300, while the sum is 36.

The square root of 55366191 is about 7440.8461212419. The cubic root of 55366191 is about 381.1373840632.

The spelling of 55366191 in words is "fifty-five million, three hundred sixty-six thousand, one hundred ninety-one".