1965808697317 has 2 divisors, whose sum is σ = 1965808697318. Its totient is φ = 1965808697316.

The previous prime is 1965808697213. The next prime is 1965808697351. The reversal of 1965808697317 is 7137968085691.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1678460166916 + 287348530401 = 1295554^2 + 536049^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1965808697317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1965808691317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 982904348658 + 982904348659.

It is an arithmetic number, because the mean of its divisors is an integer number (982904348659).

Almost surely, 2^{1965808697317} is an apocalyptic number.

It is an amenable number.

1965808697317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1965808697317 is an equidigital number, since it uses as much as digits as its factorization.

1965808697317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 137168640, while the sum is 70.

The spelling of 1965808697317 in words is "one trillion, nine hundred sixty-five billion, eight hundred eight million, six hundred ninety-seven thousand, three hundred seventeen".