25275495565 has 4 divisors (see below), whose sum is σ = 30330594684. Its totient is φ = 20220396448.

The previous prime is 25275495559. The next prime is 25275495587. The reversal of 25275495565 is 56559457252.

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 7078025161 + 18197470404 = 84131^2 + 134898^2 .

It is a cyclic number.

It is not a de Polignac number, because 25275495565 - 2²³ = 25267106957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 2527549552 + ... + 2527549561.

It is an arithmetic number, because the mean of its divisors is an integer number (7582648671).

Almost surely, 2^25275495565 is an apocalyptic number.

It is an amenable number.

25275495565 is a deficient number, since it is larger than the sum of its proper divisors (5055099119).

25275495565 is an equidigital number, since it uses as much as digits as its factorization.

25275495565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5055099118.

The product of its digits is 18900000, while the sum is 55.

The spelling of 25275495565 in words is "twenty-five billion, two hundred seventy-five million, four hundred ninety-five thousand, five hundred sixty-five".