265161320653 has 4 divisors (see below), whose sum is σ = 265581545248. Its totient is φ = 264741096060.

The previous prime is 265161320647. The next prime is 265161320701. The reversal of 265161320653 is 356023161562.

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 265161320653 - 2⁵ = 265161320621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (265161020653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210111351 + ... + 210112612.

It is an arithmetic number, because the mean of its divisors is an integer number (66395386312).

Almost surely, 2^265161320653 is an apocalyptic number.

It is an amenable number.

265161320653 is a deficient number, since it is larger than the sum of its proper divisors (420224595).

265161320653 is an equidigital number, since it uses as much as digits as its factorization.

265161320653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420224594.

The product of its (nonzero) digits is 194400, while the sum is 40.

The spelling of 265161320653 in words is "two hundred sixty-five billion, one hundred sixty-one million, three hundred twenty thousand, six hundred fifty-three".