111199661111 has 24 divisors (see below), whose sum is σ = 141135780240. Its totient is φ = 86635852800.

The previous prime is 111199661081. The next prime is 111199661143. The reversal of 111199661111 is 111166991111.

It is not a de Polignac number, because 111199661111 - 2¹⁴ = 111199644727 is a prime.

111199661111 is a strobogrammatic number because it is the same when read upside-down.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111199661161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4991345 + ... + 5013573.

It is an arithmetic number, because the mean of its divisors is an integer number (5880657510).

Almost surely, 2^111199661111 is an apocalyptic number.

111199661111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111199661111 is a deficient number, since it is larger than the sum of its proper divisors (29936119129).

111199661111 is a wasteful number, since it uses less digits than its factorization.

111199661111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31535 (or 31528 counting only the distinct ones).

The product of its digits is 2916, while the sum is 38.

The spelling of 111199661111 in words is "one hundred eleven billion, one hundred ninety-nine million, six hundred sixty-one thousand, one hundred eleven".