256166443 has 4 divisors (see below), whose sum is σ = 275871568. Its totient is φ = 236461320.

The previous prime is 256166441. The next prime is 256166461. The reversal of 256166443 is 344661652.

256166443 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 256166443 - 2¹ = 256166441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256166441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9852543 + ... + 9852568.

It is an arithmetic number, because the mean of its divisors is an integer number (68967892).

Almost surely, 2^256166443 is an apocalyptic number.

256166443 is a deficient number, since it is larger than the sum of its proper divisors (19705125).

256166443 is a wasteful number, since it uses less digits than its factorization.

256166443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19705124.

The product of its digits is 103680, while the sum is 37.

The square root of 256166443 is about 16005.2004985880. The cubic root of 256166443 is about 635.0980012838.

The spelling of 256166443 in words is "two hundred fifty-six million, one hundred sixty-six thousand, four hundred forty-three".