65765435021 has 16 divisors (see below), whose sum is σ = 78027884928. Its totient is φ = 54641352000.

The previous prime is 65765434981. The next prime is 65765435023. The reversal of 65765435021 is 12053456756.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65765435021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65765435023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2262281 + ... + 2291166.

It is an arithmetic number, because the mean of its divisors is an integer number (4876742808).

Almost surely, 2^65765435021 is an apocalyptic number.

It is an amenable number.

65765435021 is a deficient number, since it is larger than the sum of its proper divisors (12262449907).

65765435021 is a wasteful number, since it uses less digits than its factorization.

65765435021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4553572.

The product of its (nonzero) digits is 756000, while the sum is 44.

The spelling of 65765435021 in words is "sixty-five billion, seven hundred sixty-five million, four hundred thirty-five thousand, twenty-one".