6991766111 has 12 divisors (see below), whose sum is σ = 7764405936. Its totient is φ = 6290613120.

The previous prime is 6991766101. The next prime is 6991766123. The reversal of 6991766111 is 1116671996.

It is a de Polignac number, because none of the positive numbers 2^k-6991766111 is a prime.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6991766101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 286115 + ... + 309588.

It is an arithmetic number, because the mean of its divisors is an integer number (647033828).

Almost surely, 2^6991766111 is an apocalyptic number.

6991766111 is a deficient number, since it is larger than the sum of its proper divisors (772639825).

6991766111 is a wasteful number, since it uses less digits than its factorization.

6991766111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595822 (or 595811 counting only the distinct ones).

The product of its digits is 122472, while the sum is 47.

The square root of 6991766111 is about 83616.7812762486. The cubic root of 6991766111 is about 1912.1808474001.

The spelling of 6991766111 in words is "six billion, nine hundred ninety-one million, seven hundred sixty-six thousand, one hundred eleven".