55218551109 has 4 divisors (see below), whose sum is σ = 73624734816. Its totient is φ = 36812367404.

The previous prime is 55218551099. The next prime is 55218551111. The reversal of 55218551109 is 90115581255.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55218551109 - 2¹⁹ = 55218026821 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55218551149) 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, 9203091849 + ... + 9203091854.

It is an arithmetic number, because the mean of its divisors is an integer number (18406183704).

Almost surely, 2^55218551109 is an apocalyptic number.

It is an amenable number.

55218551109 is a deficient number, since it is larger than the sum of its proper divisors (18406183707).

55218551109 is a wasteful number, since it uses less digits than its factorization.

55218551109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18406183706.

The product of its (nonzero) digits is 90000, while the sum is 42.

The spelling of 55218551109 in words is "fifty-five billion, two hundred eighteen million, five hundred fifty-one thousand, one hundred nine".