25806450340 has 192 divisors, whose sum is σ = 64006225920. Its totient is φ = 8658672000.

The previous prime is 25806450311. The next prime is 25806450361. The reversal of 25806450340 is 4305460852.

It is a super-2 number, since 2×25806450340² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25806450340.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 82978785 + ... + 82979095.

It is an arithmetic number, because the mean of its divisors is an integer number (333365760).

Almost surely, 2^25806450340 is an apocalyptic number.

25806450340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25806450340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32003112960).

25806450340 is an abundant number, since it is smaller than the sum of its proper divisors (38199775580).

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

25806450340 is a wasteful number, since it uses less digits than its factorization.

25806450340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431 (or 383 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 37.

The spelling of 25806450340 in words is "twenty-five billion, eight hundred six million, four hundred fifty thousand, three hundred forty".