11663661 has 8 divisors (see below), whose sum is σ = 15882624. Its totient is φ = 7610240.

The previous prime is 11663653. The next prime is 11663669. The reversal of 11663661 is 16636611.

It is an interprime number because it is at equal distance from previous prime (11663653) and next prime (11663669).

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

It is not a de Polignac number, because 11663661 - 2³ = 11663653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11663669) 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, 41220 + ... + 41501.

It is an arithmetic number, because the mean of its divisors is an integer number (1985328).

Almost surely, 2^11663661 is an apocalyptic number.

It is an amenable number.

11663661 is a deficient number, since it is larger than the sum of its proper divisors (4218963).

11663661 is an equidigital number, since it uses as much as digits as its factorization.

11663661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82771.

The product of its digits is 3888, while the sum is 30.

The square root of 11663661 is about 3415.2102424302. The cubic root of 11663661 is about 226.7835918752.

The spelling of 11663661 in words is "eleven million, six hundred sixty-three thousand, six hundred sixty-one".