23643135661 has 2 divisors, whose sum is σ = 23643135662. Its totient is φ = 23643135660.

The previous prime is 23643135643. The next prime is 23643135767. The reversal of 23643135661 is 16653134632.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21248892900 + 2394242761 = 145770^2 + 48931^2 .

It is a cyclic number.

It is not a de Polignac number, because 23643135661 - 2⁵ = 23643135629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23643130661) 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, 11821567830 + 11821567831.

It is an arithmetic number, because the mean of its divisors is an integer number (11821567831).

Almost surely, 2^23643135661 is an apocalyptic number.

It is an amenable number.

23643135661 is a deficient number, since it is larger than the sum of its proper divisors (1).

23643135661 is an equidigital number, since it uses as much as digits as its factorization.

23643135661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 233280, while the sum is 40.

The spelling of 23643135661 in words is "twenty-three billion, six hundred forty-three million, one hundred thirty-five thousand, six hundred sixty-one".