25505065669 has 4 divisors (see below), whose sum is σ = 25533063360. Its totient is φ = 25477067980.

The previous prime is 25505065639. The next prime is 25505065717. The reversal of 25505065669 is 96656050552.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25505065669 - 2¹¹ = 25505063621 is a prime.

It is a super-2 number, since 2×25505065669² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25505065639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13997479 + ... + 13999300.

It is an arithmetic number, because the mean of its divisors is an integer number (6383265840).

Almost surely, 2^25505065669 is an apocalyptic number.

It is an amenable number.

25505065669 is a deficient number, since it is larger than the sum of its proper divisors (27997691).

25505065669 is an equidigital number, since it uses as much as digits as its factorization.

25505065669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27997690.

The product of its (nonzero) digits is 2430000, while the sum is 49.

The spelling of 25505065669 in words is "twenty-five billion, five hundred five million, sixty-five thousand, six hundred sixty-nine".