166867217 has 8 divisors (see below), whose sum is σ = 182216640. Its totient is φ = 151547760.

The previous prime is 166867187. The next prime is 166867241. The reversal of 166867217 is 712768661.

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

It is a cyclic number.

It is not a de Polignac number, because 166867217 - 2²⁴ = 150090001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166867117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5084 + ... + 18962.

It is an arithmetic number, because the mean of its divisors is an integer number (22777080).

Almost surely, 2^166867217 is an apocalyptic number.

It is an amenable number.

166867217 is a deficient number, since it is larger than the sum of its proper divisors (15349423).

166867217 is a wasteful number, since it uses less digits than its factorization.

166867217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14983.

The product of its digits is 169344, while the sum is 44.

The square root of 166867217 is about 12917.7094331774. The cubic root of 166867217 is about 550.5418538751.

The spelling of 166867217 in words is "one hundred sixty-six million, eight hundred sixty-seven thousand, two hundred seventeen".