166399452 has 36 divisors (see below), whose sum is σ = 421051176. Its totient is φ = 55409760.

The previous prime is 166399447. The next prime is 166399469. The reversal of 166399452 is 254993661.

166399452 is a `hidden beast` number, since 1 + 6 + 639 + 9 + 4 + 5 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 166399398 and 166399407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48043 + ... + 51389.

It is an arithmetic number, because the mean of its divisors is an integer number (11695866).

Almost surely, 2^166399452 is an apocalyptic number.

166399452 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

166399452 is an abundant number, since it is smaller than the sum of its proper divisors (254651724).

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

166399452 is a wasteful number, since it uses less digits than its factorization.

166399452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4738 (or 4733 counting only the distinct ones).

The product of its digits is 349920, while the sum is 45.

The square root of 166399452 is about 12899.5911563119. The cubic root of 166399452 is about 550.0269430327.

The spelling of 166399452 in words is "one hundred sixty-six million, three hundred ninety-nine thousand, four hundred fifty-two".