65813983217 has 2 divisors, whose sum is σ = 65813983218. Its totient is φ = 65813983216.

The previous prime is 65813983189. The next prime is 65813983267. The reversal of 65813983217 is 71238931856.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41838247936 + 23975735281 = 204544^2 + 154841^2 .

It is a cyclic number.

It is not a de Polignac number, because 65813983217 - 2¹⁴ = 65813966833 is a prime.

It is not a weakly prime, because it can be changed into another prime (65813983267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32906991608 + 32906991609.

It is an arithmetic number, because the mean of its divisors is an integer number (32906991609).

Almost surely, 2^65813983217 is an apocalyptic number.

It is an amenable number.

65813983217 is a deficient number, since it is larger than the sum of its proper divisors (1).

65813983217 is an equidigital number, since it uses as much as digits as its factorization.

65813983217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 53.

The spelling of 65813983217 in words is "sixty-five billion, eight hundred thirteen million, nine hundred eighty-three thousand, two hundred seventeen".