23305620991 has 2 divisors, whose sum is σ = 23305620992. Its totient is φ = 23305620990.

The previous prime is 23305620983. The next prime is 23305621043. The reversal of 23305620991 is 19902650332.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23305620991 - 2³ = 23305620983 is a prime.

It is a super-2 number, since 2×23305620991² (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 (23305620971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11652810495 + 11652810496.

It is an arithmetic number, because the mean of its divisors is an integer number (11652810496).

Almost surely, 2^23305620991 is an apocalyptic number.

23305620991 is a deficient number, since it is larger than the sum of its proper divisors (1).

23305620991 is an equidigital number, since it uses as much as digits as its factorization.

23305620991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 40.

The spelling of 23305620991 in words is "twenty-three billion, three hundred five million, six hundred twenty thousand, nine hundred ninety-one".