11997566 has 8 divisors (see below), whose sum is σ = 20567280. Its totient is φ = 5141808.

The previous prime is 11997553. The next prime is 11997577. The reversal of 11997566 is 66579911.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 428471 + ... + 428498.

It is an arithmetic number, because the mean of its divisors is an integer number (2570910).

Almost surely, 2^11997566 is an apocalyptic number.

11997566 is a deficient number, since it is larger than the sum of its proper divisors (8569714).

11997566 is an equidigital number, since it uses as much as digits as its factorization.

11997566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856978.

The product of its digits is 102060, while the sum is 44.

The square root of 11997566 is about 3463.7502796824. The cubic root of 11997566 is about 228.9273683836.

The spelling of 11997566 in words is "eleven million, nine hundred ninety-seven thousand, five hundred sixty-six".