166289274 has 56 divisors (see below), whose sum is σ = 396037620. Its totient is φ = 52161408.

The previous prime is 166289267. The next prime is 166289293. The reversal of 166289274 is 472982661.

It is a happy number.

166289274 is a `hidden beast` number, since 16 + 628 + 9 + 2 + 7 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 157628025 + 8661249 = 12555^2 + 2943^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 21432 + ... + 28140.

Almost surely, 2^166289274 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166289274, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (198018810).

166289274 is an abundant number, since it is smaller than the sum of its proper divisors (229748346).

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

166289274 is an equidigital number, since it uses as much as digits as its factorization.

166289274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6746 (or 6731 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 166289274 is about 12895.3198486893. The cubic root of 166289274 is about 549.9055198591.

The spelling of 166289274 in words is "one hundred sixty-six million, two hundred eighty-nine thousand, two hundred seventy-four".