23649804509 has 2 divisors, whose sum is σ = 23649804510. Its totient is φ = 23649804508.

The previous prime is 23649804499. The next prime is 23649804511. The reversal of 23649804509 is 90540894632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16535388100 + 7114416409 = 128590^2 + 84347^2 .

It is a cyclic number.

It is not a de Polignac number, because 23649804509 - 2²⁴ = 23633027293 is a prime.

Together with 23649804511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23649804589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11824902254 + 11824902255.

It is an arithmetic number, because the mean of its divisors is an integer number (11824902255).

Almost surely, 2^23649804509 is an apocalyptic number.

It is an amenable number.

23649804509 is a deficient number, since it is larger than the sum of its proper divisors (1).

23649804509 is an equidigital number, since it uses as much as digits as its factorization.

23649804509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1866240, while the sum is 50.

The spelling of 23649804509 in words is "twenty-three billion, six hundred forty-nine million, eight hundred four thousand, five hundred nine".