65783640815 has 16 divisors (see below), whose sum is σ = 83467776000. Its totient is φ = 49633484832.

The previous prime is 65783640787. The next prime is 65783640829. The reversal of 65783640815 is 51804638756.

It is a cyclic number.

It is not a de Polignac number, because 65783640815 - 2¹⁰ = 65783639791 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1531415 + ... + 1573784.

It is an arithmetic number, because the mean of its divisors is an integer number (5216736000).

Almost surely, 2^65783640815 is an apocalyptic number.

65783640815 is a deficient number, since it is larger than the sum of its proper divisors (17684135185).

65783640815 is a wasteful number, since it uses less digits than its factorization.

65783640815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3105446.

The product of its (nonzero) digits is 4838400, while the sum is 53.

The spelling of 65783640815 in words is "sixty-five billion, seven hundred eighty-three million, six hundred forty thousand, eight hundred fifteen".