166190213 has 12 divisors (see below), whose sum is σ = 199991340. Its totient is φ = 137535552.

The previous prime is 166190209. The next prime is 166190221. The reversal of 166190213 is 312091661.

It can be written as a sum of positive squares in 2 ways, for example, as 52085089 + 114105124 = 7217^2 + 10682^2 .

It is not a de Polignac number, because 166190213 - 2² = 166190209 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166190293) 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, 57056 + ... + 59897.

It is an arithmetic number, because the mean of its divisors is an integer number (16665945).

Almost surely, 2^166190213 is an apocalyptic number.

It is an amenable number.

166190213 is a deficient number, since it is larger than the sum of its proper divisors (33801127).

166190213 is a wasteful number, since it uses less digits than its factorization.

166190213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116996 (or 116989 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 166190213 is about 12891.4783093329. The cubic root of 166190213 is about 549.7963025295.

The spelling of 166190213 in words is "one hundred sixty-six million, one hundred ninety thousand, two hundred thirteen".