111561666 has 32 divisors (see below), whose sum is σ = 234005760. Its totient is φ = 35409024.

The previous prime is 111561649. The next prime is 111561677. The reversal of 111561666 is 666165111.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8311 + ... + 17093.

It is an arithmetic number, because the mean of its divisors is an integer number (7312680).

Almost surely, 2^111561666 is an apocalyptic number.

111561666 is an abundant number, since it is smaller than the sum of its proper divisors (122444094).

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

111561666 is a wasteful number, since it uses less digits than its factorization.

111561666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8890.

The product of its digits is 6480, while the sum is 33.

The square root of 111561666 is about 10562.2756070839. The cubic root of 111561666 is about 481.3987930087.

The spelling of 111561666 in words is "one hundred eleven million, five hundred sixty-one thousand, six hundred sixty-six".