25217680698 has 128 divisors (see below), whose sum is σ = 65131683840. Its totient is φ = 7083236160.

The previous prime is 25217680673. The next prime is 25217680699. The reversal of 25217680698 is 89608671252.

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 (25217680699) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23071440 + ... + 23072532.

It is an arithmetic number, because the mean of its divisors is an integer number (508841280).

Almost surely, 2^25217680698 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25217680698, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32565841920).

25217680698 is an abundant number, since it is smaller than the sum of its proper divisors (39914003142).

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

25217680698 is a wasteful number, since it uses less digits than its factorization.

25217680698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2089 (or 2083 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 25217680698 in words is "twenty-five billion, two hundred seventeen million, six hundred eighty thousand, six hundred ninety-eight".