55655560217 has 4 divisors (see below), whose sum is σ = 55663289856. Its totient is φ = 55647830580.

The previous prime is 55655560189. The next prime is 55655560229. The reversal of 55655560217 is 71206555655.

55655560217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 55655560217 - 2¹⁴ = 55655543833 is a prime.

It is a super-2 number, since 2×55655560217² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55655568217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3854009 + ... + 3868422.

It is an arithmetic number, because the mean of its divisors is an integer number (13915822464).

Almost surely, 2^55655560217 is an apocalyptic number.

It is an amenable number.

55655560217 is a deficient number, since it is larger than the sum of its proper divisors (7729639).

55655560217 is an equidigital number, since it uses as much as digits as its factorization.

55655560217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7729638.

The product of its (nonzero) digits is 1575000, while the sum is 47.

The spelling of 55655560217 in words is "fifty-five billion, six hundred fifty-five million, five hundred sixty thousand, two hundred seventeen".