166574166 has 36 divisors (see below), whose sum is σ = 366953916. Its totient is φ = 50371640.

The previous prime is 166574153. The next prime is 166574167. The reversal of 166574166 is 661475661.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166574167) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 347515 + ... + 347993.

Almost surely, 2^166574166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166574166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183476958).

166574166 is an abundant number, since it is smaller than the sum of its proper divisors (200379750).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166574166 is an equidigital number, since it uses as much as digits as its factorization.

166574166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985 (or 495 counting only the distinct ones).

The product of its digits is 181440, while the sum is 42.

The square root of 166574166 is about 12906.3614547246. The cubic root of 166574166 is about 550.2193791510.

The spelling of 166574166 in words is "one hundred sixty-six million, five hundred seventy-four thousand, one hundred sixty-six".