166533556 has 72 divisors (see below), whose sum is σ = 360249120. Its totient is φ = 66975552.

The previous prime is 166533551. The next prime is 166533557. The reversal of 166533556 is 655335661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166533551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 733515 + ... + 733741.

It is an arithmetic number, because the mean of its divisors is an integer number (5003460).

Almost surely, 2^166533556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166533556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180124560).

166533556 is an abundant number, since it is smaller than the sum of its proper divisors (193715564).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166533556 is a wasteful number, since it uses less digits than its factorization.

166533556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461 (or 452 counting only the distinct ones).

The product of its digits is 243000, while the sum is 40.

The square root of 166533556 is about 12904.7881036459. The cubic root of 166533556 is about 550.1746618826.

The spelling of 166533556 in words is "one hundred sixty-six million, five hundred thirty-three thousand, five hundred fifty-six".