25124441081 has 2 divisors, whose sum is σ = 25124441082. Its totient is φ = 25124441080.

The previous prime is 25124441051. The next prime is 25124441087. The reversal of 25124441081 is 18014442152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13550124025 + 11574317056 = 116405^2 + 107584^2 .

It is a cyclic number.

It is not a de Polignac number, because 25124441081 - 2²⁶ = 25057332217 is a prime.

It is a super-2 number, since 2×25124441081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (25124441087) 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, 12562220540 + 12562220541.

It is an arithmetic number, because the mean of its divisors is an integer number (12562220541).

Almost surely, 2^25124441081 is an apocalyptic number.

It is an amenable number.

25124441081 is a deficient number, since it is larger than the sum of its proper divisors (1).

25124441081 is an equidigital number, since it uses as much as digits as its factorization.

25124441081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10240, while the sum is 32.

The spelling of 25124441081 in words is "twenty-five billion, one hundred twenty-four million, four hundred forty-one thousand, eighty-one".