65788773821 has 8 divisors (see below), whose sum is σ = 65914125144. Its totient is φ = 65663542080.

The previous prime is 65788773797. The next prime is 65788773839. The reversal of 65788773821 is 12837788756.

65788773821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2882616100 + 62906157721 = 53690^2 + 250811^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65788773821 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 (65788773871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1112615 + ... + 1170251.

It is an arithmetic number, because the mean of its divisors is an integer number (8239265643).

Almost surely, 2^65788773821 is an apocalyptic number.

It is an amenable number.

65788773821 is a deficient number, since it is larger than the sum of its proper divisors (125351323).

65788773821 is a wasteful number, since it uses less digits than its factorization.

65788773821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59791.

The product of its digits is 31610880, while the sum is 62.

The spelling of 65788773821 in words is "sixty-five billion, seven hundred eighty-eight million, seven hundred seventy-three thousand, eight hundred twenty-one".