166406133 has 4 divisors (see below), whose sum is σ = 221874848. Its totient is φ = 110937420.

The previous prime is 166406129. The next prime is 166406143. The reversal of 166406133 is 331604661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 331604661 = 3 ⋅110534887.

It is not a de Polignac number, because 166406133 - 2² = 166406129 is a prime.

It is a super-2 number, since 2×166406133² = 55382002200027378, which contains 22 as substring.

It is a Duffinian number.

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 166406133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166406143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27734353 + ... + 27734358.

It is an arithmetic number, because the mean of its divisors is an integer number (55468712).

Almost surely, 2^166406133 is an apocalyptic number.

It is an amenable number.

166406133 is a deficient number, since it is larger than the sum of its proper divisors (55468715).

166406133 is an equidigital number, since it uses as much as digits as its factorization.

166406133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55468714.

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 166406133 is about 12899.8501154083. The cubic root of 166406133 is about 550.0343041964.

The spelling of 166406133 in words is "one hundred sixty-six million, four hundred six thousand, one hundred thirty-three".