23555566789 has 4 divisors (see below), whose sum is σ = 23555873824. Its totient is φ = 23555259756.

The previous prime is 23555566777. The next prime is 23555566799. The reversal of 23555566789 is 98766555532.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 23555566789 - 2⁵ = 23555566757 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23555566799) 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 3 ways as a sum of consecutive naturals, for example, 71584 + ... + 228550.

It is an arithmetic number, because the mean of its divisors is an integer number (5888968456).

Almost surely, 2^23555566789 is an apocalyptic number.

It is an amenable number.

23555566789 is a deficient number, since it is larger than the sum of its proper divisors (307035).

23555566789 is a wasteful number, since it uses less digits than its factorization.

23555566789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307034.

The product of its digits is 68040000, while the sum is 61.

The spelling of 23555566789 in words is "twenty-three billion, five hundred fifty-five million, five hundred sixty-six thousand, seven hundred eighty-nine".