8564850721 has 16 divisors (see below), whose sum is σ = 9977261184. Its totient is φ = 7199771904.

The previous prime is 8564850719. The next prime is 8564850737. The reversal of 8564850721 is 1270584658.

It is a cyclic number.

It is not a de Polignac number, because 8564850721 - 2¹ = 8564850719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8564850781) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1606366 + ... + 1611688.

It is an arithmetic number, because the mean of its divisors is an integer number (623578824).

Almost surely, 2^8564850721 is an apocalyptic number.

It is an amenable number.

8564850721 is a deficient number, since it is larger than the sum of its proper divisors (1412410463).

8564850721 is a wasteful number, since it uses less digits than its factorization.

8564850721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9720.

The product of its (nonzero) digits is 537600, while the sum is 46.

The square root of 8564850721 is about 92546.4787066477. The cubic root of 8564850721 is about 2046.0045694602.

The spelling of 8564850721 in words is "eight billion, five hundred sixty-four million, eight hundred fifty thousand, seven hundred twenty-one".