257340065 has 4 divisors (see below), whose sum is σ = 308808084. Its totient is φ = 205872048.

The previous prime is 257340049. The next prime is 257340091. The reversal of 257340065 is 560043752.

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 68442529 + 188897536 = 8273^2 + 13744^2 .

It is a cyclic number.

It is not a de Polignac number, because 257340065 - 2⁴ = 257340049 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25734002 + ... + 25734011.

It is an arithmetic number, because the mean of its divisors is an integer number (77202021).

Almost surely, 2^257340065 is an apocalyptic number.

It is an amenable number.

257340065 is a deficient number, since it is larger than the sum of its proper divisors (51468019).

257340065 is an equidigital number, since it uses as much as digits as its factorization.

257340065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51468018.

The product of its (nonzero) digits is 25200, while the sum is 32.

The square root of 257340065 is about 16041.8223715387. The cubic root of 257340065 is about 636.0664205845.

The spelling of 257340065 in words is "two hundred fifty-seven million, three hundred forty thousand, sixty-five".