23785604509 has 2 divisors, whose sum is σ = 23785604510. Its totient is φ = 23785604508.

The previous prime is 23785604443. The next prime is 23785604539. The reversal of 23785604509 is 90540658732.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15210288900 + 8575315609 = 123330^2 + 92603^2 .

It is a cyclic number.

It is not a de Polignac number, because 23785604509 - 2²⁹ = 23248733597 is a prime.

It is a super-2 number, since 2×23785604509² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23785604539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11892802254 + 11892802255.

It is an arithmetic number, because the mean of its divisors is an integer number (11892802255).

Almost surely, 2^23785604509 is an apocalyptic number.

It is an amenable number.

23785604509 is a deficient number, since it is larger than the sum of its proper divisors (1).

23785604509 is an equidigital number, since it uses as much as digits as its factorization.

23785604509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1814400, while the sum is 49.

The spelling of 23785604509 in words is "twenty-three billion, seven hundred eighty-five million, six hundred four thousand, five hundred nine".