25681047066838 has 8 divisors (see below), whose sum is σ = 38521646267688. Its totient is φ = 12840498310944.

The previous prime is 25681047066811. The next prime is 25681047066863. The reversal of 25681047066838 is 83866074018652.

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 25681047066838.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11311731 + ... + 13390942.

It is an arithmetic number, because the mean of its divisors is an integer number (4815205783461).

Almost surely, 2^{25681047066838} is an apocalyptic number.

25681047066838 is a deficient number, since it is larger than the sum of its proper divisors (12840599200850).

25681047066838 is a wasteful number, since it uses less digits than its factorization.

25681047066838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25222478.

The product of its (nonzero) digits is 92897280, while the sum is 64.

The spelling of 25681047066838 in words is "twenty-five trillion, six hundred eighty-one billion, forty-seven million, sixty-six thousand, eight hundred thirty-eight".