25686144080861 has 32 divisors (see below), whose sum is σ = 29657160192000. Its totient is φ = 22028011689600.

The previous prime is 25686144080827. The next prime is 25686144080879. The reversal of 25686144080861 is 16808044168652.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25686144080861 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25686144080861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25686144280861) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5561561 + ... + 9072113.

It is an arithmetic number, because the mean of its divisors is an integer number (926786256000).

Almost surely, 2^{25686144080861} is an apocalyptic number.

It is an amenable number.

25686144080861 is a deficient number, since it is larger than the sum of its proper divisors (3971016111139).

25686144080861 is a wasteful number, since it uses less digits than its factorization.

25686144080861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3511137.

The product of its (nonzero) digits is 17694720, while the sum is 59.

The spelling of 25686144080861 in words is "twenty-five trillion, six hundred eighty-six billion, one hundred forty-four million, eighty thousand, eight hundred sixty-one".