133555166 has 4 divisors (see below), whose sum is σ = 200332752. Its totient is φ = 66777582.

The previous prime is 133555151. The next prime is 133555183. The reversal of 133555166 is 661555331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 661555331 = 2437 ⋅271463.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33388790 + ... + 33388793.

It is an arithmetic number, because the mean of its divisors is an integer number (50083188).

Almost surely, 2^133555166 is an apocalyptic number.

133555166 is a deficient number, since it is larger than the sum of its proper divisors (66777586).

133555166 is an equidigital number, since it uses as much as digits as its factorization.

133555166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66777585.

The product of its digits is 40500, while the sum is 35.

The square root of 133555166 is about 11556.6070280165. The cubic root of 133555166 is about 511.1561187244.

The spelling of 133555166 in words is "one hundred thirty-three million, five hundred fifty-five thousand, one hundred sixty-six".