25523257609 has 2 divisors, whose sum is σ = 25523257610. Its totient is φ = 25523257608.

The previous prime is 25523257607. The next prime is 25523257651. The reversal of 25523257609 is 90675232552.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25523257600 + 9 = 159760^2 + 3^2 .

It is a cyclic number.

It is not a de Polignac number, because 25523257609 - 2¹ = 25523257607 is a prime.

Together with 25523257607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (25523257607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12761628804 + 12761628805.

It is an arithmetic number, because the mean of its divisors is an integer number (12761628805).

Almost surely, 2^25523257609 is an apocalyptic number.

It is an amenable number.

25523257609 is a deficient number, since it is larger than the sum of its proper divisors (1).

25523257609 is an equidigital number, since it uses as much as digits as its factorization.

25523257609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1134000, while the sum is 46.

The spelling of 25523257609 in words is "twenty-five billion, five hundred twenty-three million, two hundred fifty-seven thousand, six hundred nine".