25913184807281 has 2 divisors, whose sum is σ = 25913184807282. Its totient is φ = 25913184807280.

The previous prime is 25913184807269. The next prime is 25913184807329. The reversal of 25913184807281 is 18270848131952.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19667309126656 + 6245875680625 = 4434784^2 + 2499175^2 .

It is a cyclic number.

It is not a de Polignac number, because 25913184807281 - 2¹⁸ = 25913184545137 is a prime.

It is a super-2 number, since 2×25913184807281² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25913184807281.

It is not a weakly prime, because it can be changed into another prime (25913184807241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12956592403640 + 12956592403641.

It is an arithmetic number, because the mean of its divisors is an integer number (12956592403641).

Almost surely, 2^{25913184807281} is an apocalyptic number.

It is an amenable number.

25913184807281 is a deficient number, since it is larger than the sum of its proper divisors (1).

25913184807281 is an equidigital number, since it uses as much as digits as its factorization.

25913184807281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7741440, while the sum is 59.

The spelling of 25913184807281 in words is "twenty-five trillion, nine hundred thirteen billion, one hundred eighty-four million, eight hundred seven thousand, two hundred eighty-one".