9540868640591 has 2 divisors, whose sum is σ = 9540868640592. Its totient is φ = 9540868640590.

The previous prime is 9540868640551. The next prime is 9540868640707. The reversal of 9540868640591 is 1950468680459.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9540868640591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9540868640521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4770434320295 + 4770434320296.

It is an arithmetic number, because the mean of its divisors is an integer number (4770434320296).

Almost surely, 2^{9540868640591} is an apocalyptic number.

9540868640591 is a deficient number, since it is larger than the sum of its proper divisors (1).

9540868640591 is an equidigital number, since it uses as much as digits as its factorization.

9540868640591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 74649600, while the sum is 65.

The spelling of 9540868640591 in words is "nine trillion, five hundred forty billion, eight hundred sixty-eight million, six hundred forty thousand, five hundred ninety-one".