133556166 has 12 divisors (see below), whose sum is σ = 289371732. Its totient is φ = 44518716.

The previous prime is 133556141. The next prime is 133556191. The reversal of 133556166 is 661655331.

133556166 is a `hidden beast` number, since 1 + 3 + 35 + 5 + 616 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (133556141) and next prime (133556191).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 133556166.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3709876 + ... + 3709911.

It is an arithmetic number, because the mean of its divisors is an integer number (24114311).

Almost surely, 2^133556166 is an apocalyptic number.

133556166 is an abundant number, since it is smaller than the sum of its proper divisors (155815566).

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

133556166 is a wasteful number, since it uses less digits than its factorization.

133556166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7419795 (or 7419792 counting only the distinct ones).

The product of its digits is 48600, while the sum is 36.

The square root of 133556166 is about 11556.6502932294. The cubic root of 133556166 is about 511.1573944890.

The spelling of 133556166 in words is "one hundred thirty-three million, five hundred fifty-six thousand, one hundred sixty-six".