23255839781 has 2 divisors, whose sum is σ = 23255839782. Its totient is φ = 23255839780.

The previous prime is 23255839757. The next prime is 23255839891. The reversal of 23255839781 is 18793855232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22611136900 + 644702881 = 150370^2 + 25391^2 .

It is a cyclic number.

It is not a de Polignac number, because 23255839781 - 2¹⁴ = 23255823397 is a prime.

It is a super-2 number, since 2×23255839781² (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 (23255839721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11627919890 + 11627919891.

It is an arithmetic number, because the mean of its divisors is an integer number (11627919891).

Almost surely, 2^23255839781 is an apocalyptic number.

It is an amenable number.

23255839781 is a deficient number, since it is larger than the sum of its proper divisors (1).

23255839781 is an equidigital number, since it uses as much as digits as its factorization.

23255839781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3628800, while the sum is 53.

The spelling of 23255839781 in words is "twenty-three billion, two hundred fifty-five million, eight hundred thirty-nine thousand, seven hundred eighty-one".