25807423809 has 4 divisors (see below), whose sum is σ = 34409898416. Its totient is φ = 17204949204.

The previous prime is 25807423787. The next prime is 25807423819. The reversal of 25807423809 is 90832470852.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 25807423809 - 2¹² = 25807419713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25807423819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4301237299 + ... + 4301237304.

It is an arithmetic number, because the mean of its divisors is an integer number (8602474604).

Almost surely, 2^25807423809 is an apocalyptic number.

It is an amenable number.

25807423809 is a deficient number, since it is larger than the sum of its proper divisors (8602474607).

25807423809 is an equidigital number, since it uses as much as digits as its factorization.

25807423809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8602474606.

The product of its (nonzero) digits is 967680, while the sum is 48.

The spelling of 25807423809 in words is "twenty-five billion, eight hundred seven million, four hundred twenty-three thousand, eight hundred nine".