166217645 has 16 divisors (see below), whose sum is σ = 217945728. Its totient is φ = 120690240.

The previous prime is 166217621. The next prime is 166217663. The reversal of 166217645 is 546712661.

It is not a de Polignac number, because 166217645 - 2⁶ = 166217581 is a prime.

It is a super-3 number, since 3×166217645³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166217599 and 166217608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37907 + ... + 42063.

It is an arithmetic number, because the mean of its divisors is an integer number (13621608).

Almost surely, 2^166217645 is an apocalyptic number.

It is an amenable number.

166217645 is a deficient number, since it is larger than the sum of its proper divisors (51728083).

166217645 is a wasteful number, since it uses less digits than its factorization.

166217645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4900.

The product of its digits is 60480, while the sum is 38.

The square root of 166217645 is about 12892.5422240922. The cubic root of 166217645 is about 549.8265513674.

The spelling of 166217645 in words is "one hundred sixty-six million, two hundred seventeen thousand, six hundred forty-five".