23961326581 has 2 divisors, whose sum is σ = 23961326582. Its totient is φ = 23961326580.

The previous prime is 23961326539. The next prime is 23961326591. The reversal of 23961326581 is 18562316932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23131368100 + 829958481 = 152090^2 + 28809^2 .

It is a cyclic number.

It is not a de Polignac number, because 23961326581 - 2⁷ = 23961326453 is a prime.

It is a super-2 number, since 2×23961326581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23961326591) 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, 11980663290 + 11980663291.

It is an arithmetic number, because the mean of its divisors is an integer number (11980663291).

Almost surely, 2^23961326581 is an apocalyptic number.

It is an amenable number.

23961326581 is a deficient number, since it is larger than the sum of its proper divisors (1).

23961326581 is an equidigital number, since it uses as much as digits as its factorization.

23961326581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 466560, while the sum is 46.

The spelling of 23961326581 in words is "twenty-three billion, nine hundred sixty-one million, three hundred twenty-six thousand, five hundred eighty-one".