166203166 has 4 divisors (see below), whose sum is σ = 249304752. Its totient is φ = 83101582.

The previous prime is 166203143. The next prime is 166203173. The reversal of 166203166 is 661302661.

166203166 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×166203166³ (a number of 26 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41550790 + ... + 41550793.

It is an arithmetic number, because the mean of its divisors is an integer number (62326188).

Almost surely, 2^166203166 is an apocalyptic number.

166203166 is a deficient number, since it is larger than the sum of its proper divisors (83101586).

166203166 is an equidigital number, since it uses as much as digits as its factorization.

166203166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83101585.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 166203166 is about 12891.9806856821. The cubic root of 166203166 is about 549.8105860151.

The spelling of 166203166 in words is "one hundred sixty-six million, two hundred three thousand, one hundred sixty-six".