55306512217 has 4 divisors (see below), whose sum is σ = 60334376976. Its totient is φ = 50278647460.

The previous prime is 55306512211. The next prime is 55306512227. The reversal of 55306512217 is 71221560355.

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 55306512217 - 2³¹ = 53159028569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55306512211) 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, 2513932363 + ... + 2513932384.

It is an arithmetic number, because the mean of its divisors is an integer number (15083594244).

Almost surely, 2^55306512217 is an apocalyptic number.

It is an amenable number.

55306512217 is a deficient number, since it is larger than the sum of its proper divisors (5027864759).

55306512217 is a wasteful number, since it uses less digits than its factorization.

55306512217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5027864758.

The product of its (nonzero) digits is 63000, while the sum is 37.

The spelling of 55306512217 in words is "fifty-five billion, three hundred six million, five hundred twelve thousand, two hundred seventeen".