25857642036 has 24 divisors (see below), whose sum is σ = 61806072384. Its totient is φ = 8408989120.

The previous prime is 25857642023. The next prime is 25857642037. The reversal of 25857642036 is 63024675852.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25857642037) 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, 26277600 + ... + 26278583.

It is an arithmetic number, because the mean of its divisors is an integer number (2575253016).

Almost surely, 2^25857642036 is an apocalyptic number.

It is an amenable number.

25857642036 is an abundant number, since it is smaller than the sum of its proper divisors (35948430348).

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

25857642036 is a wasteful number, since it uses less digits than its factorization.

25857642036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52556231 (or 52556229 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 48.

The spelling of 25857642036 in words is "twenty-five billion, eight hundred fifty-seven million, six hundred forty-two thousand, thirty-six".