25865459620 has 384 divisors, whose sum is σ = 78277570560. Its totient is φ = 6911723520.

The previous prime is 25865459573. The next prime is 25865459621. The reversal of 25865459620 is 2695456852.

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (25865459621) 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 127 ways as a sum of consecutive naturals, for example, 20159499 + ... + 20160781.

It is an arithmetic number, because the mean of its divisors is an integer number (203847840).

Almost surely, 2^25865459620 is an apocalyptic number.

25865459620 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 25865459620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39138785280).

25865459620 is an abundant number, since it is smaller than the sum of its proper divisors (52412110940).

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

25865459620 is a wasteful number, since it uses less digits than its factorization.

25865459620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395 (or 1393 counting only the distinct ones).

The product of its (nonzero) digits is 5184000, while the sum is 52.

The spelling of 25865459620 in words is "twenty-five billion, eight hundred sixty-five million, four hundred fifty-nine thousand, six hundred twenty".