111666511 has 8 divisors (see below), whose sum is σ = 122022864. Its totient is φ = 101344320.

The previous prime is 111666479. The next prime is 111666551. The reversal of 111666511 is 115666111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 111666511 - 2⁵ = 111666479 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 111666511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111666551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1440 + ... + 15013.

It is an arithmetic number, because the mean of its divisors is an integer number (15252858).

Almost surely, 2^111666511 is an apocalyptic number.

111666511 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

111666511 is a deficient number, since it is larger than the sum of its proper divisors (10356353).

111666511 is a wasteful number, since it uses less digits than its factorization.

111666511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17081.

The product of its digits is 1080, while the sum is 28.

The square root of 111666511 is about 10567.2376239015. The cubic root of 111666511 is about 481.5495510463.

The spelling of 111666511 in words is "one hundred eleven million, six hundred sixty-six thousand, five hundred eleven".