25807780249 has 4 divisors (see below), whose sum is σ = 25808140836. Its totient is φ = 25807419664.

The previous prime is 25807780241. The next prime is 25807780259. The reversal of 25807780249 is 94208770852.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22187592025 + 3620188224 = 148955^2 + 60168^2 .

It is a cyclic number.

It is not a de Polignac number, because 25807780249 - 2³ = 25807780241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25807780196 and 25807780205.

It is not an unprimeable number, because it can be changed into a prime (25807780241) 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, 32614 + ... + 229519.

It is an arithmetic number, because the mean of its divisors is an integer number (6452035209).

Almost surely, 2^25807780249 is an apocalyptic number.

It is an amenable number.

25807780249 is a deficient number, since it is larger than the sum of its proper divisors (360587).

25807780249 is an equidigital number, since it uses as much as digits as its factorization.

25807780249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360586.

The product of its (nonzero) digits is 2257920, while the sum is 52.

The spelling of 25807780249 in words is "twenty-five billion, eight hundred seven million, seven hundred eighty thousand, two hundred forty-nine".