55655217 has 18 divisors (see below), whose sum is σ = 81261362. Its totient is φ = 36705024.

The previous prime is 55655207. The next prime is 55655221. The reversal of 55655217 is 71255655.

It is a happy number.

55655217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 41525136 + 14130081 = 6444^2 + 3759^2 .

It is not a de Polignac number, because 55655217 - 2⁸ = 55654961 is a prime.

It is a Duffinian number.

Its product of digits (52500) is a multiple of the sum of its prime divisors (375).

It is not an unprimeable number, because it can be changed into a prime (55655207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 288273 + ... + 288465.

Almost surely, 2^55655217 is an apocalyptic number.

It is an amenable number.

55655217 is a deficient number, since it is larger than the sum of its proper divisors (25606145).

55655217 is a wasteful number, since it uses less digits than its factorization.

55655217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557 (or 375 counting only the distinct ones).

The product of its digits is 52500, while the sum is 36.

The square root of 55655217 is about 7460.2424223345. The cubic root of 55655217 is about 381.7994456329.

The spelling of 55655217 in words is "fifty-five million, six hundred fifty-five thousand, two hundred seventeen".