256766223 has 24 divisors (see below), whose sum is σ = 399893760. Its totient is φ = 146118000.

The previous prime is 256766219. The next prime is 256766243. The reversal of 256766223 is 322667652.

It is a happy number.

It is not a de Polignac number, because 256766223 - 2² = 256766219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256766243) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 33418 + ... + 40376.

It is an arithmetic number, because the mean of its divisors is an integer number (16662240).

Almost surely, 2^256766223 is an apocalyptic number.

256766223 is a deficient number, since it is larger than the sum of its proper divisors (143127537).

256766223 is a wasteful number, since it uses less digits than its factorization.

256766223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7227 (or 7220 counting only the distinct ones).

The product of its digits is 181440, while the sum is 39.

The square root of 256766223 is about 16023.9265787135. The cubic root of 256766223 is about 635.5932810587.

The spelling of 256766223 in words is "two hundred fifty-six million, seven hundred sixty-six thousand, two hundred twenty-three".