25306286881 has 2 divisors, whose sum is σ = 25306286882. Its totient is φ = 25306286880.

The previous prime is 25306286879. The next prime is 25306286893. The reversal of 25306286881 is 18868260352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24768464400 + 537822481 = 157380^2 + 23191^2 .

It is a cyclic number.

It is not a de Polignac number, because 25306286881 - 2¹ = 25306286879 is a prime.

It is a super-2 number, since 2×25306286881² (a number of 22 digits) contains 22 as substring.

Together with 25306286879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25306286081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12653143440 + 12653143441.

It is an arithmetic number, because the mean of its divisors is an integer number (12653143441).

Almost surely, 2^25306286881 is an apocalyptic number.

It is an amenable number.

25306286881 is a deficient number, since it is larger than the sum of its proper divisors (1).

25306286881 is an equidigital number, since it uses as much as digits as its factorization.

25306286881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1105920, while the sum is 49.

The spelling of 25306286881 in words is "twenty-five billion, three hundred six million, two hundred eighty-six thousand, eight hundred eighty-one".