999995555511191 has 2 divisors, whose sum is σ = 999995555511192. Its totient is φ = 999995555511190.

The previous prime is 999995555511163. The next prime is 999995555511209. The reversal of 999995555511191 is 191115555599999.

It is a strong prime.

It is an emirp because it is prime and its reverse (191115555599999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999995555511191 - 2³⁴ = 999978375642007 is a prime.

It is a super-2 number, since 2×999995555511191² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999995555513191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499997777755595 + 499997777755596.

It is an arithmetic number, because the mean of its divisors is an integer number (499997777755596).

Almost surely, 2^{999995555511191} is an apocalyptic number.

999995555511191 is a deficient number, since it is larger than the sum of its proper divisors (1).

999995555511191 is an equidigital number, since it uses as much as digits as its factorization.

999995555511191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1660753125, while the sum is 83.

The spelling of 999995555511191 in words is "nine hundred ninety-nine trillion, nine hundred ninety-five billion, five hundred fifty-five million, five hundred eleven thousand, one hundred ninety-one".