23043312661 has 2 divisors, whose sum is σ = 23043312662. Its totient is φ = 23043312660.

The previous prime is 23043312637. The next prime is 23043312671. The reversal of 23043312661 is 16621334032.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15219910161 + 7823402500 = 123369^2 + 88450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23043312661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23043312671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11521656330 + 11521656331.

It is an arithmetic number, because the mean of its divisors is an integer number (11521656331).

Almost surely, 2^23043312661 is an apocalyptic number.

It is an amenable number.

23043312661 is a deficient number, since it is larger than the sum of its proper divisors (1).

23043312661 is an equidigital number, since it uses as much as digits as its factorization.

23043312661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 31.

Adding to 23043312661 its reverse (16621334032), we get a palindrome (39664646693).

The spelling of 23043312661 in words is "twenty-three billion, forty-three million, three hundred twelve thousand, six hundred sixty-one".