217168345 has 8 divisors (see below), whose sum is σ = 261039240. Its totient is φ = 173443200.

The previous prime is 217168333. The next prime is 217168363. The reversal of 217168345 is 543861712.

It can be written as a sum of positive squares in 4 ways, for example, as 35808256 + 181360089 = 5984^2 + 13467^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 217168345 - 2⁵ = 217168313 is a prime.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 33130 + ... + 39139.

It is an arithmetic number, because the mean of its divisors is an integer number (32629905).

Almost surely, 2^217168345 is an apocalyptic number.

It is an amenable number.

217168345 is a deficient number, since it is larger than the sum of its proper divisors (43870895).

217168345 is an equidigital number, since it uses as much as digits as its factorization.

217168345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72875.

The product of its digits is 40320, while the sum is 37.

The square root of 217168345 is about 14736.6327565017. The cubic root of 217168345 is about 601.0798562774.

The spelling of 217168345 in words is "two hundred seventeen million, one hundred sixty-eight thousand, three hundred forty-five".