25305055549 has 2 divisors, whose sum is σ = 25305055550. Its totient is φ = 25305055548.

The previous prime is 25305055519. The next prime is 25305055571. The reversal of 25305055549 is 94555050352.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14283835225 + 11021220324 = 119515^2 + 104982^2 .

It is a cyclic number.

It is not a de Polignac number, because 25305055549 - 2⁷ = 25305055421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25305055519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12652527774 + 12652527775.

It is an arithmetic number, because the mean of its divisors is an integer number (12652527775).

Almost surely, 2^25305055549 is an apocalyptic number.

It is an amenable number.

25305055549 is a deficient number, since it is larger than the sum of its proper divisors (1).

25305055549 is an equidigital number, since it uses as much as digits as its factorization.

25305055549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 675000, while the sum is 43.

The spelling of 25305055549 in words is "twenty-five billion, three hundred five million, fifty-five thousand, five hundred forty-nine".