166431133 has 8 divisors (see below), whose sum is σ = 183360096. Its totient is φ = 149802000.

The previous prime is 166431121. The next prime is 166431191. The reversal of 166431133 is 331134661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166431133 - 2⁵ = 166431101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166438133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73791 + ... + 76012.

It is an arithmetic number, because the mean of its divisors is an integer number (22920012).

Almost surely, 2^166431133 is an apocalyptic number.

It is an amenable number.

166431133 is a deficient number, since it is larger than the sum of its proper divisors (16928963).

166431133 is a wasteful number, since it uses less digits than its factorization.

166431133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149915.

The product of its digits is 3888, while the sum is 28.

The square root of 166431133 is about 12900.8190825234. The cubic root of 166431133 is about 550.0618475904.

Adding to 166431133 its reverse (331134661), we get a palindrome (497565794).

The spelling of 166431133 in words is "one hundred sixty-six million, four hundred thirty-one thousand, one hundred thirty-three".