1991415065411 has 2 divisors, whose sum is σ = 1991415065412. Its totient is φ = 1991415065410.

The previous prime is 1991415065401. The next prime is 1991415065413. The reversal of 1991415065411 is 1145605141991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1991415065411 - 2⁶ = 1991415065347 is a prime.

Together with 1991415065413, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1991415065413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995707532705 + 995707532706.

It is an arithmetic number, because the mean of its divisors is an integer number (995707532706).

Almost surely, 2^{1991415065411} is an apocalyptic number.

1991415065411 is a deficient number, since it is larger than the sum of its proper divisors (1).

1991415065411 is an equidigital number, since it uses as much as digits as its factorization.

1991415065411 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 47.

The spelling of 1991415065411 in words is "one trillion, nine hundred ninety-one billion, four hundred fifteen million, sixty-five thousand, four hundred eleven".