257372258809 has 4 divisors (see below), whose sum is σ = 257373280116. Its totient is φ = 257371237504.

The previous prime is 257372258779. The next prime is 257372258827. The reversal of 257372258809 is 908852273752.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 148554743184 + 108817515625 = 385428^2 + 329875^2 .

It is a cyclic number.

It is not a de Polignac number, because 257372258809 - 2¹³ = 257372250617 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257372258839) 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, 167937 + ... + 736849.

It is an arithmetic number, because the mean of its divisors is an integer number (64343320029).

Almost surely, 2^257372258809 is an apocalyptic number.

It is an amenable number.

257372258809 is a deficient number, since it is larger than the sum of its proper divisors (1021307).

257372258809 is an equidigital number, since it uses as much as digits as its factorization.

257372258809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021306.

The product of its (nonzero) digits is 16934400, while the sum is 58.

The spelling of 257372258809 in words is "two hundred fifty-seven billion, three hundred seventy-two million, two hundred fifty-eight thousand, eight hundred nine".