166163423 has 4 divisors (see below), whose sum is σ = 175937760. Its totient is φ = 156389088.

The previous prime is 166163419. The next prime is 166163429. The reversal of 166163423 is 324361661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 324361661 = 13 ⋅24950897.

It is a cyclic number.

It is not a de Polignac number, because 166163423 - 2² = 166163419 is a prime.

It is a super-2 number, since 2×166163423² = 55220566286153858, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166163423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166163429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4887143 + ... + 4887176.

It is an arithmetic number, because the mean of its divisors is an integer number (43984440).

Almost surely, 2^166163423 is an apocalyptic number.

166163423 is a deficient number, since it is larger than the sum of its proper divisors (9774337).

166163423 is an equidigital number, since it uses as much as digits as its factorization.

166163423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9774336.

The product of its digits is 15552, while the sum is 32.

The square root of 166163423 is about 12890.4392089641. The cubic root of 166163423 is about 549.7667584022.

The spelling of 166163423 in words is "one hundred sixty-six million, one hundred sixty-three thousand, four hundred twenty-three".