25774145809 has 2 divisors, whose sum is σ = 25774145810. Its totient is φ = 25774145808.

The previous prime is 25774145773. The next prime is 25774145827. The reversal of 25774145809 is 90854147752.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24107220225 + 1666925584 = 155265^2 + 40828^2 .

It is a cyclic number.

It is not a de Polignac number, because 25774145809 - 2²³ = 25765757201 is a prime.

It is not a weakly prime, because it can be changed into another prime (25774145849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12887072904 + 12887072905.

It is an arithmetic number, because the mean of its divisors is an integer number (12887072905).

Almost surely, 2^25774145809 is an apocalyptic number.

It is an amenable number.

25774145809 is a deficient number, since it is larger than the sum of its proper divisors (1).

25774145809 is an equidigital number, since it uses as much as digits as its factorization.

25774145809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2822400, while the sum is 52.

The spelling of 25774145809 in words is "twenty-five billion, seven hundred seventy-four million, one hundred forty-five thousand, eight hundred nine".