6505840785 has 16 divisors (see below), whose sum is σ = 10541111040. Its totient is φ = 3425859840.

The previous prime is 6505840777. The next prime is 6505840799. The reversal of 6505840785 is 5870485056.

It is not a de Polignac number, because 6505840785 - 2³ = 6505840777 is a prime.

It is an unprimeable number.

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, 2743896 + ... + 2746265.

It is an arithmetic number, because the mean of its divisors is an integer number (658819440).

Almost surely, 2^6505840785 is an apocalyptic number.

It is an amenable number.

6505840785 is a deficient number, since it is larger than the sum of its proper divisors (4035270255).

6505840785 is a wasteful number, since it uses less digits than its factorization.

6505840785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5490248.

The product of its (nonzero) digits is 1344000, while the sum is 48.

The square root of 6505840785 is about 80658.7923601637. The cubic root of 6505840785 is about 1866.8144058060.

The spelling of 6505840785 in words is "six billion, five hundred five million, eight hundred forty thousand, seven hundred eighty-five".