25861586100581 has 16 divisors (see below), whose sum is σ = 32244494929920. Its totient is φ = 20150961215280.

The previous prime is 25861586100569. The next prime is 25861586100607. The reversal of 25861586100581 is 18500168516852.

It is not a de Polignac number, because 25861586100581 - 2¹⁴ = 25861586084197 is a prime.

It is a super-2 number, since 2×25861586100581² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25861586100281) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 6007961 + ... + 9371166.

It is an arithmetic number, because the mean of its divisors is an integer number (2015280933120).

Almost surely, 2^{25861586100581} is an apocalyptic number.

It is an amenable number.

25861586100581 is a deficient number, since it is larger than the sum of its proper divisors (6382908829339).

25861586100581 is a wasteful number, since it uses less digits than its factorization.

25861586100581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15400984.

The product of its (nonzero) digits is 4608000, while the sum is 56.

The spelling of 25861586100581 in words is "twenty-five trillion, eight hundred sixty-one billion, five hundred eighty-six million, one hundred thousand, five hundred eighty-one".