25697516208 has 640 divisors, whose sum is σ = 88698322944. Its totient is φ = 6231859200.

The previous prime is 25697516191. The next prime is 25697516209. The reversal of 25697516208 is 80261579652.

It is not an unprimeable number, because it can be changed into a prime (25697516209) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 361936813 + ... + 361936883.

Almost surely, 2^25697516208 is an apocalyptic number.

25697516208 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 25697516208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44349161472).

25697516208 is an abundant number, since it is smaller than the sum of its proper divisors (63000806736).

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

25697516208 is a wasteful number, since it uses less digits than its factorization.

25697516208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233 (or 227 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 51.

The spelling of 25697516208 in words is "twenty-five billion, six hundred ninety-seven million, five hundred sixteen thousand, two hundred eight".