25665410465 has 4 divisors (see below), whose sum is σ = 30798492564. Its totient is φ = 20532328368.

The previous prime is 25665410447. The next prime is 25665410467. The reversal of 25665410465 is 56401456652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3021481024 + 22643929441 = 54968^2 + 150479^2 .

It is a cyclic number.

It is not a de Polignac number, because 25665410465 - 2⁶ = 25665410401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25665410467) 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 3 ways as a sum of consecutive naturals, for example, 2566541042 + ... + 2566541051.

It is an arithmetic number, because the mean of its divisors is an integer number (7699623141).

Almost surely, 2^25665410465 is an apocalyptic number.

It is an amenable number.

25665410465 is a deficient number, since it is larger than the sum of its proper divisors (5133082099).

25665410465 is an equidigital number, since it uses as much as digits as its factorization.

25665410465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5133082098.

The product of its (nonzero) digits is 864000, while the sum is 44.

The spelling of 25665410465 in words is "twenty-five billion, six hundred sixty-five million, four hundred ten thousand, four hundred sixty-five".