25493315609 has 2 divisors, whose sum is σ = 25493315610. Its totient is φ = 25493315608.

The previous prime is 25493315557. The next prime is 25493315633. The reversal of 25493315609 is 90651339452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15367321225 + 10125994384 = 123965^2 + 100628^2 .

It is a cyclic number.

It is not a de Polignac number, because 25493315609 - 2¹² = 25493311513 is a prime.

It is not a weakly prime, because it can be changed into another prime (25493317609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12746657804 + 12746657805.

It is an arithmetic number, because the mean of its divisors is an integer number (12746657805).

Almost surely, 2^25493315609 is an apocalyptic number.

It is an amenable number.

25493315609 is a deficient number, since it is larger than the sum of its proper divisors (1).

25493315609 is an equidigital number, since it uses as much as digits as its factorization.

25493315609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 874800, while the sum is 47.

The spelling of 25493315609 in words is "twenty-five billion, four hundred ninety-three million, three hundred fifteen thousand, six hundred nine".