25781326661255 has 16 divisors (see below), whose sum is σ = 33976611108000. Its totient is φ = 18624216447360.

The previous prime is 25781326661213. The next prime is 25781326661269. The reversal of 25781326661255 is 55216662318752.

It is a happy number.

It is not a de Polignac number, because 25781326661255 - 2²⁴ = 25781309884039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25781326661194 and 25781326661203.

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, 1572983060 + ... + 1572999449.

It is an arithmetic number, because the mean of its divisors is an integer number (2123538194250).

Almost surely, 2^{25781326661255} is an apocalyptic number.

25781326661255 is a deficient number, since it is larger than the sum of its proper divisors (8195284446745).

25781326661255 is a wasteful number, since it uses less digits than its factorization.

25781326661255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3145982674.

The product of its digits is 36288000, while the sum is 59.

The spelling of 25781326661255 in words is "twenty-five trillion, seven hundred eighty-one billion, three hundred twenty-six million, six hundred sixty-one thousand, two hundred fifty-five".