257840161 has 8 divisors (see below), whose sum is σ = 268439144. Its totient is φ = 247432320.

The previous prime is 257840159. The next prime is 257840171. The reversal of 257840161 is 161048752.

257840161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 115777600 + 142062561 = 10760^2 + 11919^2 .

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

It is not a de Polignac number, because 257840161 - 2¹ = 257840159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (257840171) 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, 45030 + ... + 50431.

It is an arithmetic number, because the mean of its divisors is an integer number (33554893).

Almost surely, 2^257840161 is an apocalyptic number.

It is an amenable number.

257840161 is a deficient number, since it is larger than the sum of its proper divisors (10598983).

257840161 is an equidigital number, since it uses as much as digits as its factorization.

257840161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95571.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 257840161 is about 16057.4020626003. The cubic root of 257840161 is about 636.4781824051.

The spelling of 257840161 in words is "two hundred fifty-seven million, eight hundred forty thousand, one hundred sixty-one".