11663623 has 4 divisors (see below), whose sum is σ = 11672320. Its totient is φ = 11654928.

The previous prime is 11663611. The next prime is 11663633. The reversal of 11663623 is 32636611.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 32636611 = 7 ⋅4662373.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11663623 is a prime.

It is a super-2 number, since 2×11663623² = 272080202972258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11663591 and 11663600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11663633) 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 3 ways as a sum of consecutive naturals, for example, 1863 + ... + 5176.

It is an arithmetic number, because the mean of its divisors is an integer number (2918080).

Almost surely, 2^11663623 is an apocalyptic number.

11663623 is a deficient number, since it is larger than the sum of its proper divisors (8697).

11663623 is an equidigital number, since it uses as much as digits as its factorization.

11663623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8696.

The product of its digits is 3888, while the sum is 28.

The square root of 11663623 is about 3415.2046790785. The cubic root of 11663623 is about 226.7833455893.

The spelling of 11663623 in words is "eleven million, six hundred sixty-three thousand, six hundred twenty-three".