9785517985 has 16 divisors (see below), whose sum is σ = 12439236096. Its totient is φ = 7364439808.

The previous prime is 9785517979. The next prime is 9785518003. The reversal of 9785517985 is 5897155879.

It is a happy number.

9785517985 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 9785517985 - 2³ = 9785517977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161514 + ... + 213676.

It is an arithmetic number, because the mean of its divisors is an integer number (777452256).

Almost surely, 2^9785517985 is an apocalyptic number.

It is an amenable number.

9785517985 is a deficient number, since it is larger than the sum of its proper divisors (2653718111).

9785517985 is a wasteful number, since it uses less digits than its factorization.

9785517985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54392.

The product of its digits is 31752000, while the sum is 64.

The square root of 9785517985 is about 98921.7771019102. Note that the first 3 decimals coincide. The cubic root of 9785517985 is about 2138.9203207280.

The spelling of 9785517985 in words is "nine billion, seven hundred eighty-five million, five hundred seventeen thousand, nine hundred eighty-five".