25505308055081 has 2 divisors, whose sum is σ = 25505308055082. Its totient is φ = 25505308055080.

The previous prime is 25505308055053. The next prime is 25505308055131. The reversal of 25505308055081 is 18055080350552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22238920545856 + 3266387509225 = 4715816^2 + 1807315^2 .

It is a cyclic number.

It is not a de Polignac number, because 25505308055081 - 2¹⁴ = 25505308038697 is a prime.

It is a super-2 number, since 2×25505308055081² (a number of 28 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (25505308055021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12752654027540 + 12752654027541.

It is an arithmetic number, because the mean of its divisors is an integer number (12752654027541).

Almost surely, 2^{25505308055081} is an apocalyptic number.

It is an amenable number.

25505308055081 is a deficient number, since it is larger than the sum of its proper divisors (1).

25505308055081 is an equidigital number, since it uses as much as digits as its factorization.

25505308055081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1200000, while the sum is 47.

The spelling of 25505308055081 in words is "twenty-five trillion, five hundred five billion, three hundred eight million, fifty-five thousand, eighty-one".