23663543 has 4 divisors (see below), whose sum is σ = 24064680. Its totient is φ = 23262408.

The previous prime is 23663533. The next prime is 23663551. The reversal of 23663543 is 34536632.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23663543 - 2²⁰ = 22614967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23663533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200480 + ... + 200597.

It is an arithmetic number, because the mean of its divisors is an integer number (6016170).

Almost surely, 2^23663543 is an apocalyptic number.

23663543 is a deficient number, since it is larger than the sum of its proper divisors (401137).

23663543 is an equidigital number, since it uses as much as digits as its factorization.

23663543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401136.

The product of its digits is 38880, while the sum is 32.

The square root of 23663543 is about 4864.5187840114. The cubic root of 23663543 is about 287.0956351878.

The spelling of 23663543 in words is "twenty-three million, six hundred sixty-three thousand, five hundred forty-three".