9766555543391 has 2 divisors, whose sum is σ = 9766555543392. Its totient is φ = 9766555543390.

The previous prime is 9766555543343. The next prime is 9766555543427. The reversal of 9766555543391 is 1933455556679.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9766555543391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9766555545391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4883277771695 + 4883277771696.

It is an arithmetic number, because the mean of its divisors is an integer number (4883277771696).

Almost surely, 2^{9766555543391} is an apocalyptic number.

9766555543391 is a deficient number, since it is larger than the sum of its proper divisors (1).

9766555543391 is an equidigital number, since it uses as much as digits as its factorization.

9766555543391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 459270000, while the sum is 68.

The spelling of 9766555543391 in words is "nine trillion, seven hundred sixty-six billion, five hundred fifty-five million, five hundred forty-three thousand, three hundred ninety-one".