65640076785 has 32 divisors (see below), whose sum is σ = 116959392000. Its totient is φ = 34928264448.

The previous prime is 65640076781. The next prime is 65640076793. The reversal of 65640076785 is 58767004656.

65640076785 is a `hidden beast` number, since 6 + 564 + 0 + 0 + 7 + 6 + 78 + 5 = 666.

65640076785 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 65640076785 - 2² = 65640076781 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65640076781) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 494520 + ... + 613049.

It is an arithmetic number, because the mean of its divisors is an integer number (3654981000).

Almost surely, 2^65640076785 is an apocalyptic number.

It is an amenable number.

65640076785 is a deficient number, since it is larger than the sum of its proper divisors (51319315215).

65640076785 is a wasteful number, since it uses less digits than its factorization.

65640076785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1108022 (or 1108016 counting only the distinct ones).

The product of its (nonzero) digits is 8467200, while the sum is 54.

The spelling of 65640076785 in words is "sixty-five billion, six hundred forty million, seventy-six thousand, seven hundred eighty-five".