217166045 has 8 divisors (see below), whose sum is σ = 261964800. Its totient is φ = 172822480.

The previous prime is 217166009. The next prime is 217166051. The reversal of 217166045 is 540661712.

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

It is not a de Polignac number, because 217166045 - 2⁶ = 217165981 is a prime.

It is a super-2 number, since 2×217166045² = 94322182201884050, which contains 22 as substring.

It is a congruent 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, 112745 + ... + 114654.

It is an arithmetic number, because the mean of its divisors is an integer number (32745600).

Almost surely, 2^217166045 is an apocalyptic number.

It is an amenable number.

217166045 is a deficient number, since it is larger than the sum of its proper divisors (44798755).

217166045 is a wasteful number, since it uses less digits than its factorization.

217166045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227595.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 217166045 is about 14736.5547194723. The cubic root of 217166045 is about 601.0777342852.

The spelling of 217166045 in words is "two hundred seventeen million, one hundred sixty-six thousand, forty-five".