25786287061281 has 6 divisors (see below), whose sum is σ = 37246859088530. Its totient is φ = 17190858040848.

The previous prime is 25786287061279. The next prime is 25786287061289. The reversal of 25786287061281 is 18216078268752.

25786287061281 is a `hidden beast` number, since 2 + 5 + 7 + 8 + 6 + 2 + 8 + 7 + 0 + 612 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21172743918225 + 4613543143056 = 4601385^2 + 2147916^2 .

It is not a de Polignac number, because 25786287061281 - 2¹ = 25786287061279 is a prime.

It is a super-2 number, since 2×25786287061281² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25786287061289) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1432571503396 + ... + 1432571503413.

Almost surely, 2^{25786287061281} is an apocalyptic number.

It is an amenable number.

25786287061281 is a deficient number, since it is larger than the sum of its proper divisors (11460572027249).

25786287061281 is a wasteful number, since it uses less digits than its factorization.

25786287061281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2865143006815 (or 2865143006812 counting only the distinct ones).

The product of its (nonzero) digits is 36126720, while the sum is 63.

The spelling of 25786287061281 in words is "twenty-five trillion, seven hundred eighty-six billion, two hundred eighty-seven million, sixty-one thousand, two hundred eighty-one".