166274253 has 6 divisors (see below), whose sum is σ = 240173934. Its totient is φ = 110849496.

The previous prime is 166274243. The next prime is 166274257. The reversal of 166274253 is 352472661.

166274253 is a `hidden beast` number, since 1 + 6 + 627 + 4 + 25 + 3 = 666.

166274253 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 165945924 + 328329 = 12882^2 + 573^2 .

It is not a de Polignac number, because 166274253 - 2⁴ = 166274237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166274257) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9237450 + ... + 9237467.

It is an arithmetic number, because the mean of its divisors is an integer number (40028989).

Almost surely, 2^166274253 is an apocalyptic number.

It is an amenable number.

166274253 is a deficient number, since it is larger than the sum of its proper divisors (73899681).

166274253 is a wasteful number, since it uses less digits than its factorization.

166274253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18474923 (or 18474920 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 166274253 is about 12894.7374149302. The cubic root of 166274253 is about 549.8889616062. Note that the first 3 decimals are identical.

The spelling of 166274253 in words is "one hundred sixty-six million, two hundred seventy-four thousand, two hundred fifty-three".