23723719661 has 2 divisors, whose sum is σ = 23723719662. Its totient is φ = 23723719660.

The previous prime is 23723719619. The next prime is 23723719667. The reversal of 23723719661 is 16691732732.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17607697636 + 6116022025 = 132694^2 + 78205^2 .

It is a cyclic number.

It is not a de Polignac number, because 23723719661 - 2⁶ = 23723719597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23723719667) 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, 11861859830 + 11861859831.

It is an arithmetic number, because the mean of its divisors is an integer number (11861859831).

Almost surely, 2^23723719661 is an apocalyptic number.

It is an amenable number.

23723719661 is a deficient number, since it is larger than the sum of its proper divisors (1).

23723719661 is an equidigital number, since it uses as much as digits as its factorization.

23723719661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536, while the sum is 47.

The spelling of 23723719661 in words is "twenty-three billion, seven hundred twenty-three million, seven hundred nineteen thousand, six hundred sixty-one".