25478990213 has 2 divisors, whose sum is σ = 25478990214. Its totient is φ = 25478990212.

The previous prime is 25478990197. The next prime is 25478990219. The reversal of 25478990213 is 31209987452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23006215684 + 2472774529 = 151678^2 + 49727^2 .

It is a cyclic number.

It is not a de Polignac number, because 25478990213 - 2⁴ = 25478990197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25478990219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12739495106 + 12739495107.

It is an arithmetic number, because the mean of its divisors is an integer number (12739495107).

Almost surely, 2^25478990213 is an apocalyptic number.

It is an amenable number.

25478990213 is a deficient number, since it is larger than the sum of its proper divisors (1).

25478990213 is an equidigital number, since it uses as much as digits as its factorization.

25478990213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 25478990213 in words is "twenty-five billion, four hundred seventy-eight million, nine hundred ninety thousand, two hundred thirteen".