257530427809 has 4 divisors (see below), whose sum is σ = 258655015060. Its totient is φ = 256405840560.

The previous prime is 257530427797. The next prime is 257530427813. The reversal of 257530427809 is 908724035752.

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 118561771584 + 138968656225 = 344328^2 + 372785^2 .

It is a cyclic number.

It is not a de Polignac number, because 257530427809 - 2¹³ = 257530419617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257530428809) 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, 562293282 + ... + 562293739.

It is an arithmetic number, because the mean of its divisors is an integer number (64663753765).

Almost surely, 2^257530427809 is an apocalyptic number.

It is an amenable number.

257530427809 is a deficient number, since it is larger than the sum of its proper divisors (1124587251).

257530427809 is a wasteful number, since it uses less digits than its factorization.

257530427809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124587250.

The product of its (nonzero) digits is 4233600, while the sum is 52.

The spelling of 257530427809 in words is "two hundred fifty-seven billion, five hundred thirty million, four hundred twenty-seven thousand, eight hundred nine".