166581532 has 24 divisors (see below), whose sum is σ = 315127232. Its totient is φ = 76593600.

The previous prime is 166581529. The next prime is 166581551. The reversal of 166581532 is 235185661.

It is a junction number, because it is equal to n+sod(n) for n = 166581491 and 166581500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8182 + ... + 20002.

Almost surely, 2^166581532 is an apocalyptic number.

It is an amenable number.

166581532 is a deficient number, since it is larger than the sum of its proper divisors (148545700).

166581532 is a wasteful number, since it uses less digits than its factorization.

166581532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12109 (or 12107 counting only the distinct ones).

The product of its digits is 43200, while the sum is 37.

The square root of 166581532 is about 12906.6468147230. The cubic root of 166581532 is about 550.2274893646.

The spelling of 166581532 in words is "one hundred sixty-six million, five hundred eighty-one thousand, five hundred thirty-two".