23340509981 has 2 divisors, whose sum is σ = 23340509982. Its totient is φ = 23340509980.

The previous prime is 23340509957. The next prime is 23340510073. The reversal of 23340509981 is 18990504332.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17553865081 + 5786644900 = 132491^2 + 76070^2 .

It is a cyclic number.

It is not a de Polignac number, because 23340509981 - 2¹⁸ = 23340247837 is a prime.

It is a super-2 number, since 2×23340509981² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23340509921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11670254990 + 11670254991.

It is an arithmetic number, because the mean of its divisors is an integer number (11670254991).

Almost surely, 2^23340509981 is an apocalyptic number.

It is an amenable number.

23340509981 is a deficient number, since it is larger than the sum of its proper divisors (1).

23340509981 is an equidigital number, since it uses as much as digits as its factorization.

23340509981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 233280, while the sum is 44.

The spelling of 23340509981 in words is "twenty-three billion, three hundred forty million, five hundred nine thousand, nine hundred eighty-one".