166873869 has 6 divisors (see below), whose sum is σ = 241040046. Its totient is φ = 111249240.

The previous prime is 166873867. The next prime is 166873879. The reversal of 166873869 is 968378661.

It is a happy number.

166873869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 156875625 + 9998244 = 12525^2 + 3162^2 .

It is not a de Polignac number, because 166873869 - 2¹ = 166873867 is a prime.

It is a super-2 number, since 2×166873869² = 55693776310058322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166873867) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9270762 + ... + 9270779.

It is an arithmetic number, because the mean of its divisors is an integer number (40173341).

Almost surely, 2^166873869 is an apocalyptic number.

It is an amenable number.

166873869 is a deficient number, since it is larger than the sum of its proper divisors (74166177).

166873869 is a wasteful number, since it uses less digits than its factorization.

166873869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18541547 (or 18541544 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 166873869 is about 12917.9669065995. The cubic root of 166873869 is about 550.5491693838.

The spelling of 166873869 in words is "one hundred sixty-six million, eight hundred seventy-three thousand, eight hundred sixty-nine".