257578471649 has 8 divisors (see below), whose sum is σ = 258728081280. Its totient is φ = 256429461456.

The previous prime is 257578471589. The next prime is 257578471679. The reversal of 257578471649 is 946174875752.

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

It is a cyclic number.

It is not a de Polignac number, because 257578471649 - 2²⁴ = 257561694433 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (257578471679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 722759 + ... + 1018595.

It is an arithmetic number, because the mean of its divisors is an integer number (32341010160).

Almost surely, 2^257578471649 is an apocalyptic number.

It is an amenable number.

257578471649 is a deficient number, since it is larger than the sum of its proper divisors (1149609631).

257578471649 is a wasteful number, since it uses less digits than its factorization.

257578471649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299719.

The product of its digits is 118540800, while the sum is 65.

The spelling of 257578471649 in words is "two hundred fifty-seven billion, five hundred seventy-eight million, four hundred seventy-one thousand, six hundred forty-nine".