25806817832 has 16 divisors (see below), whose sum is σ = 48390814260. Its totient is φ = 12902600704.

The previous prime is 25806817793. The next prime is 25806817837. The reversal of 25806817832 is 23871860852.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21191789476 + 4615028356 = 145574^2 + 67934^2 .

It is a super-2 number, since 2×25806817832² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25806817837) 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, 47528 + ... + 232104.

Almost surely, 2^25806817832 is an apocalyptic number.

It is an amenable number.

25806817832 is a deficient number, since it is larger than the sum of its proper divisors (22583996428).

25806817832 is a wasteful number, since it uses less digits than its factorization.

25806817832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202060 (or 202056 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 50.

The spelling of 25806817832 in words is "twenty-five billion, eight hundred six million, eight hundred seventeen thousand, eight hundred thirty-two".