25998607847689 has 9 divisors (see below), whose sum is σ = 26648400669159. Its totient is φ = 25364291505840.

The previous prime is 25998607847687. The next prime is 25998607847701. The reversal of 25998607847689 is 98674870689952.

The square root of 25998607847689 is 5098883.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1252758617289 + 24745849230400 = 1119267^2 + 4974520^2 .

It is not a de Polignac number, because 25998607847689 - 2¹ = 25998607847687 is a prime.

It is a super-2 number, since 2×25998607847689² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25998607847687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 208992022 + ... + 209116384.

Almost surely, 2^{25998607847689} is an apocalyptic number.

25998607847689 is the 5098883-rd square number.

25998607847689 is the 2549442-nd centered octagonal number.

It is an amenable number.

25998607847689 is a deficient number, since it is larger than the sum of its proper divisors (649792821470).

25998607847689 is an frugal number, since it uses more digits than its factorization.

25998607847689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248808 (or 124404 counting only the distinct ones).

The product of its (nonzero) digits is 26336378880, while the sum is 88.

The spelling of 25998607847689 in words is "twenty-five trillion, nine hundred ninety-eight billion, six hundred seven million, eight hundred forty-seven thousand, six hundred eighty-nine".