166531333 has 4 divisors (see below), whose sum is σ = 175296160. Its totient is φ = 157766508.

The previous prime is 166531307. The next prime is 166531429. The reversal of 166531333 is 333135661.

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.

It is a cyclic number.

It is not a de Polignac number, because 166531333 - 2⁵ = 166531301 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166531295 and 166531304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166531033) 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, 4382385 + ... + 4382422.

It is an arithmetic number, because the mean of its divisors is an integer number (43824040).

Almost surely, 2^166531333 is an apocalyptic number.

It is an amenable number.

166531333 is a deficient number, since it is larger than the sum of its proper divisors (8764827).

166531333 is an equidigital number, since it uses as much as digits as its factorization.

166531333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8764826.

The product of its digits is 14580, while the sum is 31.

The square root of 166531333 is about 12904.7019725370. The cubic root of 166531333 is about 550.1722138400.

Adding to 166531333 its reverse (333135661), we get a palindrome (499666994).

The spelling of 166531333 in words is "one hundred sixty-six million, five hundred thirty-one thousand, three hundred thirty-three".