25454763281 has 2 divisors, whose sum is σ = 25454763282. Its totient is φ = 25454763280.

The previous prime is 25454763233. The next prime is 25454763319. The reversal of 25454763281 is 18236745452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24487242256 + 967521025 = 156484^2 + 31105^2 .

It is a cyclic number.

It is not a de Polignac number, because 25454763281 - 2¹⁰ = 25454762257 is a prime.

It is a super-2 number, since 2×25454763281² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25454768281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12727381640 + 12727381641.

It is an arithmetic number, because the mean of its divisors is an integer number (12727381641).

Almost surely, 2^25454763281 is an apocalyptic number.

It is an amenable number.

25454763281 is a deficient number, since it is larger than the sum of its proper divisors (1).

25454763281 is an equidigital number, since it uses as much as digits as its factorization.

25454763281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1612800, while the sum is 47.

The spelling of 25454763281 in words is "twenty-five billion, four hundred fifty-four million, seven hundred sixty-three thousand, two hundred eighty-one".