166387823 has 8 divisors (see below), whose sum is σ = 201343392. Its totient is φ = 134228736.

The previous prime is 166387813. The next prime is 166387831. The reversal of 166387823 is 328783661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 166387823 - 2¹⁶ = 166322287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166387813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 698990 + ... + 699227.

It is an arithmetic number, because the mean of its divisors is an integer number (25167924).

Almost surely, 2^166387823 is an apocalyptic number.

166387823 is a deficient number, since it is larger than the sum of its proper divisors (34955569).

166387823 is a wasteful number, since it uses less digits than its factorization.

166387823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398241.

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

The square root of 166387823 is about 12899.1403977164. The cubic root of 166387823 is about 550.0141296645.

The spelling of 166387823 in words is "one hundred sixty-six million, three hundred eighty-seven thousand, eight hundred twenty-three".