111666541 has 12 divisors (see below), whose sum is σ = 135546912. Its totient is φ = 91551768.

The previous prime is 111666479. The next prime is 111666551. The reversal of 111666541 is 145666111.

It is not a de Polignac number, because 111666541 - 2¹¹ = 111664493 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 48415 + ... + 50668.

It is an arithmetic number, because the mean of its divisors is an integer number (11295576).

Almost surely, 2^111666541 is an apocalyptic number.

It is an amenable number.

111666541 is a deficient number, since it is larger than the sum of its proper divisors (23880371).

111666541 is an equidigital number, since it uses as much as digits as its factorization.

111666541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99120 (or 99113 counting only the distinct ones).

The product of its digits is 4320, while the sum is 31.

The square root of 111666541 is about 10567.2390433831. The cubic root of 111666541 is about 481.5495941702.

The spelling of 111666541 in words is "one hundred eleven million, six hundred sixty-six thousand, five hundred forty-one".