6509790985 has 32 divisors (see below), whose sum is σ = 8123908608. Its totient is φ = 5004529920.

The previous prime is 6509790983. The next prime is 6509791007. The reversal of 6509790985 is 5890979056.

It is not a de Polignac number, because 6509790985 - 2¹ = 6509790983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6509790983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4573984 + ... + 4575406.

It is an arithmetic number, because the mean of its divisors is an integer number (253872144).

Almost surely, 2^6509790985 is an apocalyptic number.

It is an amenable number.

6509790985 is a deficient number, since it is larger than the sum of its proper divisors (1614117623).

6509790985 is a wasteful number, since it uses less digits than its factorization.

6509790985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825.

The product of its (nonzero) digits is 6123600, while the sum is 58.

The square root of 6509790985 is about 80683.2757453489. The cubic root of 6509790985 is about 1867.1921585829.

The spelling of 6509790985 in words is "six billion, five hundred nine million, seven hundred ninety thousand, nine hundred eighty-five".