23653636661 has 2 divisors, whose sum is σ = 23653636662. Its totient is φ = 23653636660.

The previous prime is 23653636637. The next prime is 23653636663. The reversal of 23653636661 is 16663635632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17379412561 + 6274224100 = 131831^2 + 79210^2 .

It is a cyclic number.

It is not a de Polignac number, because 23653636661 - 2⁶ = 23653636597 is a prime.

Together with 23653636663, 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 (23653636663) 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, 11826818330 + 11826818331.

It is an arithmetic number, because the mean of its divisors is an integer number (11826818331).

Almost surely, 2^23653636661 is an apocalyptic number.

It is an amenable number.

23653636661 is a deficient number, since it is larger than the sum of its proper divisors (1).

23653636661 is an equidigital number, since it uses as much as digits as its factorization.

23653636661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2099520, while the sum is 47.

The spelling of 23653636661 in words is "twenty-three billion, six hundred fifty-three million, six hundred thirty-six thousand, six hundred sixty-one".