25808812801655 has 16 divisors (see below), whose sum is σ = 33375913601184. Its totient is φ = 19045680585600.

The previous prime is 25808812801619. The next prime is 25808812801679. The reversal of 25808812801655 is 55610821880852.

It is a de Polignac number, because none of the positive numbers 2^k-25808812801655 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25808812801594 and 25808812801603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136728104 + ... + 136916733.

It is an arithmetic number, because the mean of its divisors is an integer number (2085994600074).

Almost surely, 2^{25808812801655} is an apocalyptic number.

25808812801655 is a deficient number, since it is larger than the sum of its proper divisors (7567100799529).

25808812801655 is a wasteful number, since it uses less digits than its factorization.

25808812801655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273646306.

The product of its (nonzero) digits is 12288000, while the sum is 59.

The spelling of 25808812801655 in words is "twenty-five trillion, eight hundred eight billion, eight hundred twelve million, eight hundred one thousand, six hundred fifty-five".