16166565 has 24 divisors (see below), whose sum is σ = 28307448. Its totient is φ = 8534400.

The previous prime is 16166533. The next prime is 16166569. The reversal of 16166565 is 56566161.

It can be written as a sum of positive squares in 4 ways, for example, as 2461761 + 13704804 = 1569^2 + 3702^2 .

It is not a de Polignac number, because 16166565 - 2⁵ = 16166533 is a prime.

It is a super-2 number, since 2×16166565² = 522715647798450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16166569) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2767 + ... + 6323.

It is an arithmetic number, because the mean of its divisors is an integer number (1179477).

Almost surely, 2^16166565 is an apocalyptic number.

16166565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16166565 is a deficient number, since it is larger than the sum of its proper divisors (12140883).

16166565 is a wasteful number, since it uses less digits than its factorization.

16166565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3669 (or 3666 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 16166565 is about 4020.7667179283. The cubic root of 16166565 is about 252.8556045651.

The spelling of 16166565 in words is "sixteen million, one hundred sixty-six thousand, five hundred sixty-five".