55106642191 has 4 divisors (see below), whose sum is σ = 58006991800. Its totient is φ = 52206292584.

The previous prime is 55106642167. The next prime is 55106642209. The reversal of 55106642191 is 19124660155.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 55106642191 - 2¹⁹ = 55106117903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55106642291) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1450174776 + ... + 1450174813.

It is an arithmetic number, because the mean of its divisors is an integer number (14501747950).

Almost surely, 2^55106642191 is an apocalyptic number.

55106642191 is a deficient number, since it is larger than the sum of its proper divisors (2900349609).

55106642191 is a wasteful number, since it uses less digits than its factorization.

55106642191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2900349608.

The product of its (nonzero) digits is 64800, while the sum is 40.

The spelling of 55106642191 in words is "fifty-five billion, one hundred six million, six hundred forty-two thousand, one hundred ninety-one".