25920117686 has 8 divisors (see below), whose sum is σ = 38911971024. Its totient is φ = 12949460680.

The previous prime is 25920117679. The next prime is 25920117689. The reversal of 25920117686 is 68671102952.

It is a happy number.

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 25920117686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25920117689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5296025 + ... + 5300916.

It is an arithmetic number, because the mean of its divisors is an integer number (4863996378).

Almost surely, 2^25920117686 is an apocalyptic number.

25920117686 is a deficient number, since it is larger than the sum of its proper divisors (12991853338).

25920117686 is a wasteful number, since it uses less digits than its factorization.

25920117686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10598166.

The product of its (nonzero) digits is 362880, while the sum is 47.

The spelling of 25920117686 in words is "twenty-five billion, nine hundred twenty million, one hundred seventeen thousand, six hundred eighty-six".