10011111108991 has 2 divisors, whose sum is σ = 10011111108992. Its totient is φ = 10011111108990.

The previous prime is 10011111108983. The next prime is 10011111109001. The reversal of 10011111108991 is 19980111111001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10011111108991 - 2³ = 10011111108983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10011111108091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5005555554495 + 5005555554496.

It is an arithmetic number, because the mean of its divisors is an integer number (5005555554496).

Almost surely, 2^{10011111108991} is an apocalyptic number.

10011111108991 is a deficient number, since it is larger than the sum of its proper divisors (1).

10011111108991 is an equidigital number, since it uses as much as digits as its factorization.

10011111108991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 34.

Adding to 10011111108991 its reverse (19980111111001), we get a palindrome (29991222219992).

The spelling of 10011111108991 in words is "ten trillion, eleven billion, one hundred eleven million, one hundred eight thousand, nine hundred ninety-one".