11911666 has 16 divisors (see below), whose sum is σ = 19331928. Its totient is φ = 5472000.

The previous prime is 11911639. The next prime is 11911667. The reversal of 11911666 is 66611911.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6943225 + 4968441 = 2635^2 + 2229^2 .

It is not an unprimeable number, because it can be changed into a prime (11911667) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5316 + ... + 7216.

Almost surely, 2^11911666 is an apocalyptic number.

11911666 is a deficient number, since it is larger than the sum of its proper divisors (7420262).

11911666 is a wasteful number, since it uses less digits than its factorization.

11911666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2157.

The product of its digits is 1944, while the sum is 31.

The square root of 11911666 is about 3451.3281501474. The cubic root of 11911666 is about 228.3797022825.

The spelling of 11911666 in words is "eleven million, nine hundred eleven thousand, six hundred sixty-six".