257066 has 8 divisors (see below), whose sum is σ = 390720. Its totient is φ = 126828.

The previous prime is 257053. The next prime is 257069. The reversal of 257066 is 660752.

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

It is not an unprimeable number, because it can be changed into a prime (257069) by changing a digit.

257066 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 656 + ... + 971.

It is an arithmetic number, because the mean of its divisors is an integer number (48840).

2²⁵⁷⁰⁶⁶ is an apocalyptic number.

257066 is a deficient number, since it is larger than the sum of its proper divisors (133654).

257066 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 8 representation: 257066 = (766052)₈.

257066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1708.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 257066 is about 507.0167650088. The cubic root of 257066 is about 63.5840538586.

The spelling of 257066 in words is "two hundred fifty-seven thousand, sixty-six".