256533066 has 48 divisors (see below), whose sum is σ = 569462400. Its totient is φ = 83438784.

The previous prime is 256533061. The next prime is 256533071. The reversal of 256533066 is 660335652.

256533066 is a `hidden beast` number, since 2 + 565 + 3 + 30 + 66 = 666.

It is an interprime number because it is at equal distance from previous prime (256533061) and next prime (256533071).

It is a self number, because there is not a number n which added to its sum of digits gives 256533066.

It is not an unprimeable number, because it can be changed into a prime (256533061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 125545 + ... + 127571.

It is an arithmetic number, because the mean of its divisors is an integer number (11863800).

Almost surely, 2^256533066 is an apocalyptic number.

256533066 is an abundant number, since it is smaller than the sum of its proper divisors (312929334).

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

256533066 is a wasteful number, since it uses less digits than its factorization.

256533066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2203 (or 2200 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 36.

The square root of 256533066 is about 16016.6496496614. The cubic root of 256533066 is about 635.4008389491.

The spelling of 256533066 in words is "two hundred fifty-six million, five hundred thirty-three thousand, sixty-six".