217066055 has 16 divisors (see below), whose sum is σ = 262924704. Its totient is φ = 172032000.

The previous prime is 217066043. The next prime is 217066063. The reversal of 217066055 is 550660712.

It is a happy number.

It is not a de Polignac number, because 217066055 - 2⁶ = 217065991 is a prime.

It is a super-3 number, since 3×217066055³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 322199 + ... + 322871.

It is an arithmetic number, because the mean of its divisors is an integer number (16432794).

Almost surely, 2^217066055 is an apocalyptic number.

217066055 is a deficient number, since it is larger than the sum of its proper divisors (45858649).

217066055 is a wasteful number, since it uses less digits than its factorization.

217066055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1186.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 217066055 is about 14733.1617448530. The cubic root of 217066055 is about 600.9854684966.

The spelling of 217066055 in words is "two hundred seventeen million, sixty-six thousand, fifty-five".