166908213 has 12 divisors (see below), whose sum is σ = 241514988. Its totient is φ = 111075840.

The previous prime is 166908211. The next prime is 166908229. The reversal of 166908213 is 312809661.

It can be written as a sum of positive squares in 2 ways, for example, as 165328164 + 1580049 = 12858^2 + 1257^2 .

It is not a de Polignac number, because 166908213 - 2¹ = 166908211 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166908211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10878 + ... + 21263.

It is an arithmetic number, because the mean of its divisors is an integer number (20126249).

Almost surely, 2^166908213 is an apocalyptic number.

It is an amenable number.

166908213 is a deficient number, since it is larger than the sum of its proper divisors (74606775).

166908213 is a wasteful number, since it uses less digits than its factorization.

166908213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32724 (or 32721 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 166908213 is about 12919.2961495586. The cubic root of 166908213 is about 550.5869359592.

The spelling of 166908213 in words is "one hundred sixty-six million, nine hundred eight thousand, two hundred thirteen".