166442533 has 4 divisors (see below), whose sum is σ = 167657580. Its totient is φ = 165227488.

The previous prime is 166442501. The next prime is 166442561. The reversal of 166442533 is 335244661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 335244661 = 3881 ⋅86381.

It can be written as a sum of positive squares in 2 ways, for example, as 82573569 + 83868964 = 9087^2 + 9158^2 .

It is a cyclic number.

It is not a de Polignac number, because 166442533 - 2⁵ = 166442501 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 (166442593) 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, 607318 + ... + 607591.

It is an arithmetic number, because the mean of its divisors is an integer number (41914395).

Almost surely, 2^166442533 is an apocalyptic number.

It is an amenable number.

166442533 is a deficient number, since it is larger than the sum of its proper divisors (1215047).

166442533 is a wasteful number, since it uses less digits than its factorization.

166442533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1215046.

The product of its digits is 51840, while the sum is 34.

The square root of 166442533 is about 12901.2609073687. The cubic root of 166442533 is about 550.0744064624.

The spelling of 166442533 in words is "one hundred sixty-six million, four hundred forty-two thousand, five hundred thirty-three".