25025055221 has 2 divisors, whose sum is σ = 25025055222. Its totient is φ = 25025055220.

The previous prime is 25025055197. The next prime is 25025055277. The reversal of 25025055221 is 12255052052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19813659121 + 5211396100 = 140761^2 + 72190^2 .

It is a cyclic number.

It is not a de Polignac number, because 25025055221 - 2¹⁸ = 25024793077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25025055281) 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, 12512527610 + 12512527611.

It is an arithmetic number, because the mean of its divisors is an integer number (12512527611).

Almost surely, 2^25025055221 is an apocalyptic number.

It is an amenable number.

25025055221 is a deficient number, since it is larger than the sum of its proper divisors (1).

25025055221 is an equidigital number, since it uses as much as digits as its factorization.

25025055221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10000, while the sum is 29.

The spelling of 25025055221 in words is "twenty-five billion, twenty-five million, fifty-five thousand, two hundred twenty-one".