25784734646 has 16 divisors (see below), whose sum is σ = 42226237440. Its totient is φ = 11711157480.

The previous prime is 25784734607. The next prime is 25784734673. The reversal of 25784734646 is 64643748752.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25784734591 and 25784734600.

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 7 ways as a sum of consecutive naturals, for example, 430046 + ... + 486321.

It is an arithmetic number, because the mean of its divisors is an integer number (2639139840).

Almost surely, 2^25784734646 is an apocalyptic number.

25784734646 is a deficient number, since it is larger than the sum of its proper divisors (16441502794).

25784734646 is a wasteful number, since it uses less digits than its factorization.

25784734646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 917659.

The product of its digits is 27095040, while the sum is 56.

The spelling of 25784734646 in words is "twenty-five billion, seven hundred eighty-four million, seven hundred thirty-four thousand, six hundred forty-six".