256066 has 4 divisors (see below), whose sum is σ = 384102. Its totient is φ = 128032.

The previous prime is 256057. The next prime is 256079. The reversal of 256066 is 660652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 221841 + 34225 = 471^2 + 185^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 256066.

It is a congruent number.

It is an unprimeable number.

256066 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 as a sum of consecutive naturals, namely, 64015 + ... + 64018.

2²⁵⁶⁰⁶⁶ is an apocalyptic number.

256066 is a deficient number, since it is larger than the sum of its proper divisors (128036).

256066 is a wasteful number, since it uses less digits than its factorization.

256066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128035.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 256066 is about 506.0296434005. The cubic root of 256066 is about 63.5014983010.

The spelling of 256066 in words is "two hundred fifty-six thousand, sixty-six".