166397872 has 20 divisors (see below), whose sum is σ = 326938896. Its totient is φ = 82026560.

The previous prime is 166397867. The next prime is 166397897. The reversal of 166397872 is 278793661.

It is a happy number.

166397872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×166397872² = 55376503612256768, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72103 + ... + 74374.

Almost surely, 2^166397872 is an apocalyptic number.

It is an amenable number.

166397872 is a deficient number, since it is larger than the sum of its proper divisors (160541024).

166397872 is a wasteful number, since it uses less digits than its factorization.

166397872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146556 (or 146550 counting only the distinct ones).

The product of its digits is 762048, while the sum is 49.

The square root of 166397872 is about 12899.5299139155. The cubic root of 166397872 is about 550.0252021510.

The spelling of 166397872 in words is "one hundred sixty-six million, three hundred ninety-seven thousand, eight hundred seventy-two".