25986614640 has 640 divisors, whose sum is σ = 101993472000. Its totient is φ = 5339271168.

The previous prime is 25986614609. The next prime is 25986614663. The reversal of 25986614640 is 4641668952.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 62020351 + ... + 62020769.

It is an arithmetic number, because the mean of its divisors is an integer number (159364800).

Almost surely, 2^25986614640 is an apocalyptic number.

25986614640 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 25986614640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50996736000).

25986614640 is an abundant number, since it is smaller than the sum of its proper divisors (76006857360).

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

25986614640 is a wasteful number, since it uses less digits than its factorization.

25986614640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 557 (or 551 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 51.

The spelling of 25986614640 in words is "twenty-five billion, nine hundred eighty-six million, six hundred fourteen thousand, six hundred forty".