257565267213 has 4 divisors (see below), whose sum is σ = 343420356288. Its totient is φ = 171710178140.

The previous prime is 257565267209. The next prime is 257565267221. The reversal of 257565267213 is 312762565752.

257565267213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 257565267213 - 2² = 257565267209 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257565267203) by changing a digit.

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, 42927544533 + ... + 42927544538.

It is an arithmetic number, because the mean of its divisors is an integer number (85855089072).

Almost surely, 2^257565267213 is an apocalyptic number.

It is an amenable number.

257565267213 is a deficient number, since it is larger than the sum of its proper divisors (85855089075).

257565267213 is an equidigital number, since it uses as much as digits as its factorization.

257565267213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85855089074.

The product of its digits is 5292000, while the sum is 51.

The spelling of 257565267213 in words is "two hundred fifty-seven billion, five hundred sixty-five million, two hundred sixty-seven thousand, two hundred thirteen".