257897447593 has 8 divisors (see below), whose sum is σ = 266366589440. Its totient is φ = 249437672640.

The previous prime is 257897447579. The next prime is 257897447611. The reversal of 257897447593 is 395744798752.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257897447593 is a prime.

It is a super-2 number, since 2×257897447593² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257897447393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2285733 + ... + 2395906.

It is an arithmetic number, because the mean of its divisors is an integer number (33295823680).

Almost surely, 2^257897447593 is an apocalyptic number.

It is an amenable number.

257897447593 is a deficient number, since it is larger than the sum of its proper divisors (8469141847).

257897447593 is a wasteful number, since it uses less digits than its factorization.

257897447593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4683447.

The product of its digits is 533433600, while the sum is 70.

The spelling of 257897447593 in words is "two hundred fifty-seven billion, eight hundred ninety-seven million, four hundred forty-seven thousand, five hundred ninety-three".