111666663 has 6 divisors (see below), whose sum is σ = 161296304. Its totient is φ = 74444436.

The previous prime is 111666649. The next prime is 111666677. The reversal of 111666663 is 366666111.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (111666649) and next prime (111666677).

It is not a de Polignac number, because 111666663 - 2⁵ = 111666631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111666613) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6203695 + ... + 6203712.

Almost surely, 2^111666663 is an apocalyptic number.

111666663 is a deficient number, since it is larger than the sum of its proper divisors (49629641).

111666663 is a wasteful number, since it uses less digits than its factorization.

111666663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12407413 (or 12407410 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 111666663 is about 10567.2448159395. The cubic root of 111666663 is about 481.5497695406.

The spelling of 111666663 in words is "one hundred eleven million, six hundred sixty-six thousand, six hundred sixty-three".