25800842646 has 24 divisors (see below), whose sum is σ = 55960893144. Its totient is φ = 8591193600.

The previous prime is 25800842621. The next prime is 25800842651. The reversal of 25800842646 is 64624800852.

25800842646 is a `hidden beast` number, since 2 + 580 + 0 + 8 + 4 + 2 + 64 + 6 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 739755 + ... + 773846.

It is an arithmetic number, because the mean of its divisors is an integer number (2331703881).

Almost surely, 2^25800842646 is an apocalyptic number.

25800842646 is an abundant number, since it is smaller than the sum of its proper divisors (30160050498).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25800842646 is a wasteful number, since it uses less digits than its factorization.

25800842646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1514556 (or 1514553 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 45.

The spelling of 25800842646 in words is "twenty-five billion, eight hundred million, eight hundred forty-two thousand, six hundred forty-six".