23543219809 has 2 divisors, whose sum is σ = 23543219810. Its totient is φ = 23543219808.

The previous prime is 23543219801. The next prime is 23543219873. The reversal of 23543219809 is 90891234532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22545923409 + 997296400 = 150153^2 + 31580^2 .

It is a cyclic number.

It is not a de Polignac number, because 23543219809 - 2³ = 23543219801 is a prime.

It is not a weakly prime, because it can be changed into another prime (23543219801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11771609904 + 11771609905.

It is an arithmetic number, because the mean of its divisors is an integer number (11771609905).

Almost surely, 2^23543219809 is an apocalyptic number.

It is an amenable number.

23543219809 is a deficient number, since it is larger than the sum of its proper divisors (1).

23543219809 is an equidigital number, since it uses as much as digits as its factorization.

23543219809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 466560, while the sum is 46.

The spelling of 23543219809 in words is "twenty-three billion, five hundred forty-three million, two hundred nineteen thousand, eight hundred nine".