166016423 has 4 divisors (see below), whose sum is σ = 166170240. Its totient is φ = 165862608.

The previous prime is 166016399. The next prime is 166016449. The reversal of 166016423 is 324610661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 324610661 = 23 ⋅14113507.

It is a cyclic number.

It is not a de Polignac number, because 166016423 - 2¹⁶ = 165950887 is a prime.

It is a super-2 number, since 2×166016423² = 55122905411429858, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166016453) 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, 75278 + ... + 77451.

It is an arithmetic number, because the mean of its divisors is an integer number (41542560).

Almost surely, 2^166016423 is an apocalyptic number.

166016423 is a deficient number, since it is larger than the sum of its proper divisors (153817).

166016423 is a wasteful number, since it uses less digits than its factorization.

166016423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153816.

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 166016423 is about 12884.7360469666. The cubic root of 166016423 is about 549.6045896258.

The spelling of 166016423 in words is "one hundred sixty-six million, sixteen thousand, four hundred twenty-three".