23563555 has 4 divisors (see below), whose sum is σ = 28276272. Its totient is φ = 18850840.

The previous prime is 23563549. The next prime is 23563571. The reversal of 23563555 is 55536532.

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

It is a de Polignac number, because none of the positive numbers 2^k-23563555 is a prime.

It is a super-2 number, since 2×23563555² = 1110482248476050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23563555.

It is an unprimeable number.

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, 2356351 + ... + 2356360.

It is an arithmetic number, because the mean of its divisors is an integer number (7069068).

Almost surely, 2^23563555 is an apocalyptic number.

23563555 is a deficient number, since it is larger than the sum of its proper divisors (4712717).

23563555 is an equidigital number, since it uses as much as digits as its factorization.

23563555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4712716.

The product of its digits is 67500, while the sum is 34.

The square root of 23563555 is about 4854.2306290493. The cubic root of 23563555 is about 286.6906994154.

The spelling of 23563555 in words is "twenty-three million, five hundred sixty-three thousand, five hundred fifty-five".