25809004450 has 12 divisors (see below), whose sum is σ = 48004748370. Its totient is φ = 10323601760.

The previous prime is 25809004447. The next prime is 25809004451. The reversal of 25809004450 is 5440090852.

It can be written as a sum of positive squares in 3 ways, for example, as 11107684449 + 14701320001 = 105393^2 + 121249^2 .

It is a super-2 number, since 2×25809004450² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25809004451) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 258089995 + ... + 258090094.

Almost surely, 2^25809004450 is an apocalyptic number.

25809004450 is a deficient number, since it is larger than the sum of its proper divisors (22195743920).

25809004450 is a wasteful number, since it uses less digits than its factorization.

25809004450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516180101 (or 516180096 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

The spelling of 25809004450 in words is "twenty-five billion, eight hundred nine million, four thousand, four hundred fifty".