11681663 has 8 divisors (see below), whose sum is σ = 13453440. Its totient is φ = 9935640.

The previous prime is 11681653. The next prime is 11681689. The reversal of 11681663 is 36618611.

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

It is a cyclic number.

It is not a de Polignac number, because 11681663 - 2¹⁰ = 11680639 is a prime.

It is a super-2 number, since 2×11681663² = 272922500891138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11681623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5453 + ... + 7286.

It is an arithmetic number, because the mean of its divisors is an integer number (1681680).

Almost surely, 2^11681663 is an apocalyptic number.

11681663 is a deficient number, since it is larger than the sum of its proper divisors (1771777).

11681663 is a wasteful number, since it uses less digits than its factorization.

11681663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12877.

The product of its digits is 5184, while the sum is 32.

The square root of 11681663 is about 3417.8447887521. The cubic root of 11681663 is about 226.9002064798.

The spelling of 11681663 in words is "eleven million, six hundred eighty-one thousand, six hundred sixty-three".