25863810640 has 40 divisors (see below), whose sum is σ = 60665534568. Its totient is φ = 10253967360.

The previous prime is 25863810617. The next prime is 25863810647. The reversal of 25863810640 is 4601836852.

It can be written as a sum of positive squares in 4 ways, for example, as 107412496 + 25756398144 = 10364^2 + 160488^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25863810647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1421481 + ... + 1439560.

Almost surely, 2^25863810640 is an apocalyptic number.

25863810640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25863810640 is an abundant number, since it is smaller than the sum of its proper divisors (34801723928).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25863810640 is a wasteful number, since it uses less digits than its factorization.

25863810640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2861167 (or 2861161 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 43.

The spelling of 25863810640 in words is "twenty-five billion, eight hundred sixty-three million, eight hundred ten thousand, six hundred forty".