166423 has 4 divisors (see below), whose sum is σ = 167608. Its totient is φ = 165240.

The previous prime is 166417. The next prime is 166429. The reversal of 166423 is 324661.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (166417) and next prime (166429).

It is a cyclic number.

It is not a de Polignac number, because 166423 - 2¹³ = 158231 is a prime.

It is a super-2 number, since 2×166423² = 55393229858, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 166394 and 166403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166429) 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, 348 + ... + 673.

It is an arithmetic number, because the mean of its divisors is an integer number (41902).

2¹⁶⁶⁴²³ is an apocalyptic number.

166423 is a deficient number, since it is larger than the sum of its proper divisors (1185).

166423 is a wasteful number, since it uses less digits than its factorization.

166423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184.

The product of its digits is 864, while the sum is 22.

The square root of 166423 is about 407.9497518077. The cubic root of 166423 is about 55.0052887476.

The spelling of 166423 in words is "one hundred sixty-six thousand, four hundred twenty-three".