25861563893 has 6 divisors (see below), whose sum is σ = 28426347222. Its totient is φ = 23510512520.

The previous prime is 25861563829. The next prime is 25861563899. The reversal of 25861563893 is 39836516852.

It can be written as a sum of positive squares in only one way, i.e., 24460334404 + 1401229489 = 156398^2 + 37433^2 .

It is not a de Polignac number, because 25861563893 - 2⁶ = 25861563829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25861563899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 106865846 + ... + 106866087.

It is an arithmetic number, because the mean of its divisors is an integer number (4737724537).

Almost surely, 2^25861563893 is an apocalyptic number.

It is an amenable number.

25861563893 is a deficient number, since it is larger than the sum of its proper divisors (2564783329).

25861563893 is a wasteful number, since it uses less digits than its factorization.

25861563893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213731955 (or 213731944 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 56.

The spelling of 25861563893 in words is "twenty-five billion, eight hundred sixty-one million, five hundred sixty-three thousand, eight hundred ninety-three".