25809551960 has 16 divisors (see below), whose sum is σ = 58071492000. Its totient is φ = 10323820768.

The previous prime is 25809551953. The next prime is 25809551981. The reversal of 25809551960 is 6915590852.

It is a super-2 number, since 2×25809551960² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25809551899 and 25809551908.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322619360 + ... + 322619439.

It is an arithmetic number, because the mean of its divisors is an integer number (3629468250).

Almost surely, 2^25809551960 is an apocalyptic number.

25809551960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25809551960 is an abundant number, since it is smaller than the sum of its proper divisors (32261940040).

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

25809551960 is a wasteful number, since it uses less digits than its factorization.

25809551960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645238810 (or 645238806 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 50.

The spelling of 25809551960 in words is "twenty-five billion, eight hundred nine million, five hundred fifty-one thousand, nine hundred sixty".