65638413857 has 2 divisors, whose sum is σ = 65638413858. Its totient is φ = 65638413856.

The previous prime is 65638413787. The next prime is 65638413877. The reversal of 65638413857 is 75831483656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40166573056 + 25471840801 = 200416^2 + 159599^2 .

It is a cyclic number.

It is not a de Polignac number, because 65638413857 - 2¹² = 65638409761 is a prime.

It is not a weakly prime, because it can be changed into another prime (65638413877) 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 as a sum of consecutive naturals, namely, 32819206928 + 32819206929.

It is an arithmetic number, because the mean of its divisors is an integer number (32819206929).

Almost surely, 2^65638413857 is an apocalyptic number.

It is an amenable number.

65638413857 is a deficient number, since it is larger than the sum of its proper divisors (1).

65638413857 is an equidigital number, since it uses as much as digits as its factorization.

65638413857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14515200, while the sum is 56.

The spelling of 65638413857 in words is "sixty-five billion, six hundred thirty-eight million, four hundred thirteen thousand, eight hundred fifty-seven".