253566566065 has 4 divisors (see below), whose sum is σ = 304279879284. Its totient is φ = 202853252848.

The previous prime is 253566566059. The next prime is 253566566093. The reversal of 253566566065 is 560665665352.

It is a happy number.

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 114028457761 + 139538108304 = 337681^2 + 373548^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-253566566065 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 253566565997 and 253566566015.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25356656602 + ... + 25356656611.

It is an arithmetic number, because the mean of its divisors is an integer number (76069969821).

Almost surely, 2^253566566065 is an apocalyptic number.

It is an amenable number.

253566566065 is a deficient number, since it is larger than the sum of its proper divisors (50713313219).

253566566065 is an equidigital number, since it uses as much as digits as its factorization.

253566566065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50713313218.

The product of its (nonzero) digits is 29160000, while the sum is 55.

The spelling of 253566566065 in words is "two hundred fifty-three billion, five hundred sixty-six million, five hundred sixty-six thousand, sixty-five".