166534423 has 4 divisors (see below), whose sum is σ = 181673928. Its totient is φ = 151394920.

The previous prime is 166534391. The next prime is 166534477. The reversal of 166534423 is 324435661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 324435661 = 11 ⋅29494151.

It is a cyclic number.

It is not a de Polignac number, because 166534423 - 2⁵ = 166534391 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 (166535423) 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, 7569736 + ... + 7569757.

It is an arithmetic number, because the mean of its divisors is an integer number (45418482).

Almost surely, 2^166534423 is an apocalyptic number.

166534423 is a deficient number, since it is larger than the sum of its proper divisors (15139505).

166534423 is a wasteful number, since it uses less digits than its factorization.

166534423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15139504.

The product of its digits is 51840, while the sum is 34.

The square root of 166534423 is about 12904.8216957849. The cubic root of 166534423 is about 550.1756166464.

The spelling of 166534423 in words is "one hundred sixty-six million, five hundred thirty-four thousand, four hundred twenty-three".