25691785678 has 8 divisors (see below), whose sum is σ = 41502115368. Its totient is φ = 11857747224.

The previous prime is 25691785673. The next prime is 25691785723. The reversal of 25691785678 is 87658719652.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25691785673) 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, 494072776 + ... + 494072827.

It is an arithmetic number, because the mean of its divisors is an integer number (5187764421).

Almost surely, 2^25691785678 is an apocalyptic number.

25691785678 is a deficient number, since it is larger than the sum of its proper divisors (15810329690).

25691785678 is a wasteful number, since it uses less digits than its factorization.

25691785678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988145618.

The product of its digits is 50803200, while the sum is 64.

The spelling of 25691785678 in words is "twenty-five billion, six hundred ninety-one million, seven hundred eighty-five thousand, six hundred seventy-eight".