166985874 has 80 divisors (see below), whose sum is σ = 413471520. Its totient is φ = 49947840.

The previous prime is 166985867. The next prime is 166985879. The reversal of 166985874 is 478589661.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 166985874.

It is not an unprimeable number, because it can be changed into a prime (166985879) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 147342 + ... + 148470.

It is an arithmetic number, because the mean of its divisors is an integer number (5168394).

Almost surely, 2^166985874 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166985874, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206735760).

166985874 is an abundant number, since it is smaller than the sum of its proper divisors (246485646).

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

166985874 is a wasteful number, since it uses less digits than its factorization.

166985874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1237 (or 1228 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 166985874 is about 12922.3014204127. The cubic root of 166985874 is about 550.6723172219.

The spelling of 166985874 in words is "one hundred sixty-six million, nine hundred eighty-five thousand, eight hundred seventy-four".