25998784678 has 8 divisors (see below), whose sum is σ = 39012168240. Its totient is φ = 12994728600.

The previous prime is 25998784661. The next prime is 25998784681. The reversal of 25998784678 is 87648789952.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 25998784678.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2324898 + ... + 2336053.

It is an arithmetic number, because the mean of its divisors is an integer number (4876521030).

Almost surely, 2^25998784678 is an apocalyptic number.

25998784678 is a deficient number, since it is larger than the sum of its proper divisors (13013383562).

25998784678 is a wasteful number, since it uses less digits than its factorization.

25998784678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4663742.

The product of its digits is 487710720, while the sum is 73.

The spelling of 25998784678 in words is "twenty-five billion, nine hundred ninety-eight million, seven hundred eighty-four thousand, six hundred seventy-eight".