25645832645 has 8 divisors (see below), whose sum is σ = 30775975704. Its totient is φ = 20516015104.

The previous prime is 25645832629. The next prime is 25645832657. The reversal of 25645832645 is 54623854652.

It can be written as a sum of positive squares in 4 ways, for example, as 11003380609 + 14642452036 = 104897^2 + 121006^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25645832645 - 2⁴ = 25645832629 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25645832593 and 25645832602.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 153677 + ... + 273693.

It is an arithmetic number, because the mean of its divisors is an integer number (3846996963).

Almost surely, 2^25645832645 is an apocalyptic number.

It is an amenable number.

25645832645 is a deficient number, since it is larger than the sum of its proper divisors (5130143059).

25645832645 is a wasteful number, since it uses less digits than its factorization.

25645832645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162759.

The product of its digits is 6912000, while the sum is 50.

The spelling of 25645832645 in words is "twenty-five billion, six hundred forty-five million, eight hundred thirty-two thousand, six hundred forty-five".