25699666608 has 960 divisors, whose sum is σ = 101847052800. Its totient is φ = 6113802240.

The previous prime is 25699666579. The next prime is 25699666613. The reversal of 25699666608 is 80666699652.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 163692066 + ... + 163692222.

It is an arithmetic number, because the mean of its divisors is an integer number (106090680).

Almost surely, 2^25699666608 is an apocalyptic number.

25699666608 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 25699666608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50923526400).

25699666608 is an abundant number, since it is smaller than the sum of its proper divisors (76147386192).

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

25699666608 is a wasteful number, since it uses less digits than its factorization.

25699666608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255 (or 236 counting only the distinct ones).

The product of its (nonzero) digits is 50388480, while the sum is 63.

The spelling of 25699666608 in words is "twenty-five billion, six hundred ninety-nine million, six hundred sixty-six thousand, six hundred eight".