217552065 has 8 divisors (see below), whose sum is σ = 348083328. Its totient is φ = 116027760.

The previous prime is 217552037. The next prime is 217552073. The reversal of 217552065 is 560255712.

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

It is not a de Polignac number, because 217552065 - 2¹⁷ = 217420993 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7251721 + ... + 7251750.

It is an arithmetic number, because the mean of its divisors is an integer number (43510416).

Almost surely, 2^217552065 is an apocalyptic number.

It is an amenable number.

217552065 is a deficient number, since it is larger than the sum of its proper divisors (130531263).

217552065 is a wasteful number, since it uses less digits than its factorization.

217552065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14503479.

The product of its (nonzero) digits is 21000, while the sum is 33.

The square root of 217552065 is about 14749.6462669448. The cubic root of 217552065 is about 601.4336688166.

The spelling of 217552065 in words is "two hundred seventeen million, five hundred fifty-two thousand, sixty-five".