25996391568 has 360 divisors, whose sum is σ = 88936593408. Its totient is φ = 6942449664.

The previous prime is 25996391567. The next prime is 25996391579. The reversal of 25996391568 is 86519369952.

25996391568 is a `hidden beast` number, since 2 + 5 + 9 + 9 + 63 + 9 + 1 + 568 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25996391563) 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 71 ways as a sum of consecutive naturals, for example, 67875505 + ... + 67875887.

Almost surely, 2^25996391568 is an apocalyptic number.

25996391568 is a gapful number since it is divisible by the number (28) 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 25996391568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44468296704).

25996391568 is an abundant number, since it is smaller than the sum of its proper divisors (62940201840).

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

25996391568 is a wasteful number, since it uses less digits than its factorization.

25996391568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671 (or 645 counting only the distinct ones).

The product of its digits is 31492800, while the sum is 63.

The spelling of 25996391568 in words is "twenty-five billion, nine hundred ninety-six million, three hundred ninety-one thousand, five hundred sixty-eight".