111666640 has 40 divisors (see below), whose sum is σ = 263195208. Its totient is φ = 44052480.

The previous prime is 111666631. The next prime is 111666649. The reversal of 111666640 is 46666111.

It is an interprime number because it is at equal distance from previous prime (111666631) and next prime (111666649).

It can be written as a sum of positive squares in 4 ways, for example, as 32171584 + 79495056 = 5672^2 + 8916^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111666649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3721 + ... + 15400.

Almost surely, 2^111666640 is an apocalyptic number.

111666640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111666640 is an abundant number, since it is smaller than the sum of its proper divisors (151528568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

111666640 is a wasteful number, since it uses less digits than its factorization.

111666640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19207 (or 19201 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 111666640 is about 10567.2437276709. The cubic root of 111666640 is about 481.5497364790.

The spelling of 111666640 in words is "one hundred eleven million, six hundred sixty-six thousand, six hundred forty".