257340561 has 8 divisors (see below), whose sum is σ = 343986624. Its totient is φ = 171127440.

The previous prime is 257340527. The next prime is 257340571. The reversal of 257340561 is 165043752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 257340561 - 2⁶ = 257340497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (257340571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106845 + ... + 109226.

It is an arithmetic number, because the mean of its divisors is an integer number (42998328).

Almost surely, 2^257340561 is an apocalyptic number.

It is an amenable number.

257340561 is a deficient number, since it is larger than the sum of its proper divisors (86646063).

257340561 is a wasteful number, since it uses less digits than its factorization.

257340561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216471.

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 257340561 is about 16041.8378311215. The cubic root of 257340561 is about 636.0668292379.

It can be divided in two parts, 2573 and 40561, that added together give a palindrome (43134).

The spelling of 257340561 in words is "two hundred fifty-seven million, three hundred forty thousand, five hundred sixty-one".