53817979766909 has 2 divisors, whose sum is σ = 53817979766910. Its totient is φ = 53817979766908.

The previous prime is 53817979766843. The next prime is 53817979766911. The reversal of 53817979766909 is 90966797971835.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46406027966809 + 7411951800100 = 6812197^2 + 2722490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53817979766909 is a prime.

Together with 53817979766911, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53817979766939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26908989883454 + 26908989883455.

It is an arithmetic number, because the mean of its divisors is an integer number (26908989883455).

Almost surely, 2^{53817979766909} is an apocalyptic number.

It is an amenable number.

53817979766909 is a deficient number, since it is larger than the sum of its proper divisors (1).

53817979766909 is an equidigital number, since it uses as much as digits as its factorization.

53817979766909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9721827360, while the sum is 86.

The spelling of 53817979766909 in words is "fifty-three trillion, eight hundred seventeen billion, nine hundred seventy-nine million, seven hundred sixty-six thousand, nine hundred nine".