25955826665 has 4 divisors (see below), whose sum is σ = 31146992004. Its totient is φ = 20764661328.

The previous prime is 25955826643. The next prime is 25955826707. The reversal of 25955826665 is 56662855952.

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 17241790864 + 8714035801 = 131308^2 + 93349^2 .

It is a cyclic number.

It is not a de Polignac number, because 25955826665 - 2²⁰ = 25954778089 is a prime.

It is a super-4 number, since 4×25955826665⁴ (a number of 43 digits) contains 4444 as substring.

It is a Duffinian number.

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 2595582662 + ... + 2595582671.

It is an arithmetic number, because the mean of its divisors is an integer number (7786748001).

Almost surely, 2^25955826665 is an apocalyptic number.

It is an amenable number.

25955826665 is a deficient number, since it is larger than the sum of its proper divisors (5191165339).

25955826665 is an equidigital number, since it uses as much as digits as its factorization.

25955826665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5191165338.

The product of its digits is 38880000, while the sum is 59.

The spelling of 25955826665 in words is "twenty-five billion, nine hundred fifty-five million, eight hundred twenty-six thousand, six hundred sixty-five".