8166242585 has 4 divisors (see below), whose sum is σ = 9799491108. Its totient is φ = 6532994064.

The previous prime is 8166242537. The next prime is 8166242603. The reversal of 8166242585 is 5852426618.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3874813504 + 4291429081 = 62248^2 + 65509^2 .

It is a cyclic number.

It is not a de Polignac number, because 8166242585 - 2⁶ = 8166242521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 816624254 + ... + 816624263.

It is an arithmetic number, because the mean of its divisors is an integer number (2449872777).

Almost surely, 2^8166242585 is an apocalyptic number.

It is an amenable number.

8166242585 is a deficient number, since it is larger than the sum of its proper divisors (1633248523).

8166242585 is a wasteful number, since it uses less digits than its factorization.

8166242585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1633248522.

The product of its digits is 921600, while the sum is 47.

The square root of 8166242585 is about 90367.2650078556. The cubic root of 8166242585 is about 2013.7586810531.

The spelling of 8166242585 in words is "eight billion, one hundred sixty-six million, two hundred forty-two thousand, five hundred eighty-five".