2002000111991 has 12 divisors (see below), whose sum is σ = 2227058186136. Its totient is φ = 1798072380720.

The previous prime is 2002000111981. The next prime is 2002000111999. The reversal of 2002000111991 is 1991110002002.

It is a de Polignac number, because none of the positive numbers 2^k-2002000111991 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2002000111991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2002000111999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99661376 + ... + 99681461.

It is an arithmetic number, because the mean of its divisors is an integer number (185588182178).

Almost surely, 2^{2002000111991} is an apocalyptic number.

2002000111991 is a deficient number, since it is larger than the sum of its proper divisors (225058074145).

2002000111991 is a wasteful number, since it uses less digits than its factorization.

2002000111991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199342942 (or 199342931 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 26.

Adding to 2002000111991 its reverse (1991110002002), we get a palindrome (3993110113993).

It can be divided in two parts, 200200011 and 1991, that added together give a palindrome (200202002).

The spelling of 2002000111991 in words is "two trillion, two billion, one hundred eleven thousand, nine hundred ninety-one".