16166385 has 40 divisors (see below), whose sum is σ = 29272320. Its totient is φ = 8535456.

The previous prime is 16166357. The next prime is 16166389. The reversal of 16166385 is 58366161.

It is a happy number.

16166385 is a `hidden beast` number, since 1 + 6 + 16 + 638 + 5 = 666.

It is not a de Polignac number, because 16166385 - 2⁷ = 16166257 is a prime.

It is a super-2 number, since 2×16166385² = 522704007936450, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16166389) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 72384 + ... + 72606.

It is an arithmetic number, because the mean of its divisors is an integer number (731808).

Almost surely, 2^16166385 is an apocalyptic number.

16166385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16166385 is a deficient number, since it is larger than the sum of its proper divisors (13105935).

16166385 is a wasteful number, since it uses less digits than its factorization.

16166385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419 (or 410 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 16166385 is about 4020.7443340755. The cubic root of 16166385 is about 252.8546661226.

It can be divided in two parts, 1616 and 6385, that added together give a triangular number (8001 = T₁₂₆).

The spelling of 16166385 in words is "sixteen million, one hundred sixty-six thousand, three hundred eighty-five".