23643007909 has 2 divisors, whose sum is σ = 23643007910. Its totient is φ = 23643007908.

The previous prime is 23643007901. The next prime is 23643007951. The reversal of 23643007909 is 90970034632.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23341117284 + 301890625 = 152778^2 + 17375^2 .

It is a cyclic number.

It is not a de Polignac number, because 23643007909 - 2³ = 23643007901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23643007901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11821503954 + 11821503955.

It is an arithmetic number, because the mean of its divisors is an integer number (11821503955).

Almost surely, 2^23643007909 is an apocalyptic number.

It is an amenable number.

23643007909 is a deficient number, since it is larger than the sum of its proper divisors (1).

23643007909 is an equidigital number, since it uses as much as digits as its factorization.

23643007909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 43.

The spelling of 23643007909 in words is "twenty-three billion, six hundred forty-three million, seven thousand, nine hundred nine".