166825217 has 8 divisors (see below), whose sum is σ = 180804456. Its totient is φ = 153009792.

The previous prime is 166825171. The next prime is 166825247. The reversal of 166825217 is 712528661.

It can be written as a sum of positive squares in 4 ways, for example, as 698896 + 166126321 = 836^2 + 12889^2 .

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

It is not a de Polignac number, because 166825217 - 2¹⁰ = 166824193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166825247) 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, 38828 + ... + 42909.

It is an arithmetic number, because the mean of its divisors is an integer number (22600557).

Almost surely, 2^166825217 is an apocalyptic number.

It is an amenable number.

166825217 is a deficient number, since it is larger than the sum of its proper divisors (13979239).

166825217 is a wasteful number, since it uses less digits than its factorization.

166825217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81907.

The product of its digits is 40320, while the sum is 38.

The square root of 166825217 is about 12916.0836556597. The cubic root of 166825217 is about 550.4956600640.

The spelling of 166825217 in words is "one hundred sixty-six million, eight hundred twenty-five thousand, two hundred seventeen".