55216290817 has 4 divisors (see below), whose sum is σ = 55586870100. Its totient is φ = 54845711536.

The previous prime is 55216290799. The next prime is 55216290821. The reversal of 55216290817 is 71809261255.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3603720961 + 51612569856 = 60031^2 + 227184^2 .

It is a cyclic number.

It is not a de Polignac number, because 55216290817 - 2³⁵ = 20856552449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55216290847) 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, 185289418 + ... + 185289715.

It is an arithmetic number, because the mean of its divisors is an integer number (13896717525).

Almost surely, 2^55216290817 is an apocalyptic number.

It is an amenable number.

55216290817 is a deficient number, since it is larger than the sum of its proper divisors (370579283).

55216290817 is a wasteful number, since it uses less digits than its factorization.

55216290817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370579282.

The product of its (nonzero) digits is 302400, while the sum is 46.

The spelling of 55216290817 in words is "fifty-five billion, two hundred sixteen million, two hundred ninety thousand, eight hundred seventeen".