8513564985 has 24 divisors (see below), whose sum is σ = 14779290240. Its totient is φ = 4533662112.

The previous prime is 8513564971. The next prime is 8513565019. The reversal of 8513564985 is 5894653158.

8513564985 is a `hidden beast` number, since 8 + 513 + 5 + 6 + 49 + 85 = 666.

It is not a de Polignac number, because 8513564985 - 2⁸ = 8513564729 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 113889 + ... + 173198.

It is an arithmetic number, because the mean of its divisors is an integer number (615803760).

Almost surely, 2^8513564985 is an apocalyptic number.

It is an amenable number.

8513564985 is a deficient number, since it is larger than the sum of its proper divisors (6265725255).

8513564985 is a wasteful number, since it uses less digits than its factorization.

8513564985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287757 (or 287754 counting only the distinct ones).

The product of its digits is 5184000, while the sum is 54.

The square root of 8513564985 is about 92268.9817056631. The cubic root of 8513564985 is about 2041.9126129776.

The spelling of 8513564985 in words is "eight billion, five hundred thirteen million, five hundred sixty-four thousand, nine hundred eighty-five".