25704895409 has 2 divisors, whose sum is σ = 25704895410. Its totient is φ = 25704895408.

The previous prime is 25704895399. The next prime is 25704895421. The reversal of 25704895409 is 90459840752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20294851600 + 5410043809 = 142460^2 + 73553^2 .

It is a cyclic number.

It is not a de Polignac number, because 25704895409 - 2²⁴ = 25688118193 is a prime.

It is not a weakly prime, because it can be changed into another prime (25704895499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12852447704 + 12852447705.

It is an arithmetic number, because the mean of its divisors is an integer number (12852447705).

Almost surely, 2^25704895409 is an apocalyptic number.

It is an amenable number.

25704895409 is a deficient number, since it is larger than the sum of its proper divisors (1).

25704895409 is an equidigital number, since it uses as much as digits as its factorization.

25704895409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3628800, while the sum is 53.

The spelling of 25704895409 in words is "twenty-five billion, seven hundred four million, eight hundred ninety-five thousand, four hundred nine".