257201660 has 24 divisors (see below), whose sum is σ = 542142720. Its totient is φ = 102496064.

The previous prime is 257201657. The next prime is 257201671. The reversal of 257201660 is 66102752.

It is a congruent number.

It is an unprimeable number.

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, 18524 + ... + 29283.

It is an arithmetic number, because the mean of its divisors is an integer number (22589280).

Almost surely, 2^257201660 is an apocalyptic number.

257201660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

257201660 is an abundant number, since it is smaller than the sum of its proper divisors (284941060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

257201660 is a wasteful number, since it uses less digits than its factorization.

257201660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48085 (or 48083 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 257201660 is about 16037.5079111438. The cubic root of 257201660 is about 635.9523684382.

The spelling of 257201660 in words is "two hundred fifty-seven million, two hundred one thousand, six hundred sixty".