25521441481 has 2 divisors, whose sum is σ = 25521441482. Its totient is φ = 25521441480.

The previous prime is 25521441461. The next prime is 25521441509. The reversal of 25521441481 is 18414412552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21812631481 + 3708810000 = 147691^2 + 60900^2 .

It is a cyclic number.

It is not a de Polignac number, because 25521441481 - 2¹⁵ = 25521408713 is a prime.

It is a super-2 number, since 2×25521441481² (a number of 22 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 25521441481.

It is not a weakly prime, because it can be changed into another prime (25521441431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12760720740 + 12760720741.

It is an arithmetic number, because the mean of its divisors is an integer number (12760720741).

Almost surely, 2^25521441481 is an apocalyptic number.

It is an amenable number.

25521441481 is a deficient number, since it is larger than the sum of its proper divisors (1).

25521441481 is an equidigital number, since it uses as much as digits as its factorization.

25521441481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51200, while the sum is 37.

The spelling of 25521441481 in words is "twenty-five billion, five hundred twenty-one million, four hundred forty-one thousand, four hundred eighty-one".