25260260021 has 6 divisors (see below), whose sum is σ = 26161340322. Its totient is φ = 24389215760.

The previous prime is 25260259949. The next prime is 25260260041. The reversal of 25260260021 is 12006206252.

It can be written as a sum of positive squares in 3 ways, for example, as 229855921 + 25030404100 = 15161^2 + 158210^2 .

It is not a de Polignac number, because 25260260021 - 2¹⁸ = 25259997877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25260260041) 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 5 ways as a sum of consecutive naturals, for example, 15017150 + ... + 15018831.

It is an arithmetic number, because the mean of its divisors is an integer number (4360223387).

Almost surely, 2^25260260021 is an apocalyptic number.

It is an amenable number.

25260260021 is a deficient number, since it is larger than the sum of its proper divisors (901080301).

25260260021 is an equidigital number, since it uses as much as digits as its factorization.

25260260021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30036039 (or 30036010 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 25260260021 its reverse (12006206252), we get a palindrome (37266466273).

The spelling of 25260260021 in words is "twenty-five billion, two hundred sixty million, two hundred sixty thousand, twenty-one".