166823378 has 6 divisors (see below), whose sum is σ = 250262469. Its totient is φ = 83402556.

The previous prime is 166823357. The next prime is 166823407. The reversal of 166823378 is 873328661.

166823378 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 2 ways, for example, as 150234049 + 16589329 = 12257^2 + 4073^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=9133.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 13700 + ... + 22832.

Almost surely, 2^166823378 is an apocalyptic number.

166823378 is a deficient number, since it is larger than the sum of its proper divisors (83439091).

166823378 is an frugal number, since it uses more digits than its factorization.

166823378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18268 (or 9135 counting only the distinct ones).

The product of its digits is 290304, while the sum is 44.

The square root of 166823378 is about 12916.0124651535. The cubic root of 166823378 is about 550.4936372578.

The spelling of 166823378 in words is "one hundred sixty-six million, eight hundred twenty-three thousand, three hundred seventy-eight".