65784243616 has 72 divisors (see below), whose sum is σ = 162246766500. Its totient is φ = 26024527872.

The previous prime is 65784243601. The next prime is 65784243617. The reversal of 65784243616 is 61634248756.

It can be written as a sum of positive squares in 2 ways, for example, as 58457568400 + 7326675216 = 241780^2 + 85596^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (65784243617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1593241 + ... + 1634008.

Almost surely, 2^65784243616 is an apocalyptic number.

It is an amenable number.

65784243616 is an abundant number, since it is smaller than the sum of its proper divisors (96462522884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

65784243616 is a wasteful number, since it uses less digits than its factorization.

65784243616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3227286 (or 3227271 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 52.

The spelling of 65784243616 in words is "sixty-five billion, seven hundred eighty-four million, two hundred forty-three thousand, six hundred sixteen".