166643133 has 12 divisors (see below), whose sum is σ = 223328448. Its totient is φ = 110528920.

The previous prime is 166643131. The next prime is 166643149. The reversal of 166643133 is 331346661.

It is not a de Polignac number, because 166643133 - 2¹ = 166643131 is a prime.

It is a super-3 number, since 3×166643133³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 166643094 and 166643103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166643131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 386428 + ... + 386858.

It is an arithmetic number, because the mean of its divisors is an integer number (18610704).

Almost surely, 2^166643133 is an apocalyptic number.

It is an amenable number.

166643133 is a deficient number, since it is larger than the sum of its proper divisors (56685315).

166643133 is an frugal number, since it uses more digits than its factorization.

166643133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1152 (or 793 counting only the distinct ones).

The product of its digits is 23328, while the sum is 33.

The square root of 166643133 is about 12909.0330001902. The cubic root of 166643133 is about 550.2953047781.

Adding to 166643133 its reverse (331346661), we get a palindrome (497989794).

The spelling of 166643133 in words is "one hundred sixty-six million, six hundred forty-three thousand, one hundred thirty-three".