8166565 has 8 divisors (see below), whose sum is σ = 10690848. Its totient is φ = 5939280.

The previous prime is 8166559. The next prime is 8166577. The reversal of 8166565 is 5656618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8166565 - 2¹³ = 8158373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74187 + ... + 74296.

It is an arithmetic number, because the mean of its divisors is an integer number (1336356).

Almost surely, 2^8166565 is an apocalyptic number.

It is an amenable number.

8166565 is a deficient number, since it is larger than the sum of its proper divisors (2524283).

8166565 is a wasteful number, since it uses less digits than its factorization.

8166565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148499.

The product of its digits is 43200, while the sum is 37.

The square root of 8166565 is about 2857.7202452305. The cubic root of 8166565 is about 201.3785182734.

It can be divided in two parts, 816 and 6565, that added together give a triangular number (7381 = T₁₂₁).

The spelling of 8166565 in words is "eight million, one hundred sixty-six thousand, five hundred sixty-five".