25947910656 has 200 divisors, whose sum is σ = 79949954304. Its totient is φ = 8369879040.

The previous prime is 25947910619. The next prime is 25947910657. The reversal of 25947910656 is 65601974952.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (25947910657) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 1275541 + ... + 1295723.

Almost surely, 2^25947910656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25947910656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39974977152).

25947910656 is an abundant number, since it is smaller than the sum of its proper divisors (54002043648).

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

25947910656 is an equidigital number, since it uses as much as digits as its factorization.

25947910656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20244 (or 20219 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 54.

The spelling of 25947910656 in words is "twenty-five billion, nine hundred forty-seven million, nine hundred ten thousand, six hundred fifty-six".