25484936809 has 2 divisors, whose sum is σ = 25484936810. Its totient is φ = 25484936808.

The previous prime is 25484936803. The next prime is 25484936881. The reversal of 25484936809 is 90863948452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19209128409 + 6275808400 = 138597^2 + 79220^2 .

It is a cyclic number.

It is not a de Polignac number, because 25484936809 - 2⁷ = 25484936681 is a prime.

It is not a weakly prime, because it can be changed into another prime (25484936803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12742468404 + 12742468405.

It is an arithmetic number, because the mean of its divisors is an integer number (12742468405).

Almost surely, 2^25484936809 is an apocalyptic number.

It is an amenable number.

25484936809 is a deficient number, since it is larger than the sum of its proper divisors (1).

25484936809 is an equidigital number, since it uses as much as digits as its factorization.

25484936809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14929920, while the sum is 58.

The spelling of 25484936809 in words is "twenty-five billion, four hundred eighty-four million, nine hundred thirty-six thousand, eight hundred nine".