256164403 has 16 divisors (see below), whose sum is σ = 296144640. Its totient is φ = 219132000.

The previous prime is 256164361. The next prime is 256164421. The reversal of 256164403 is 304461652.

It is a cyclic number.

It is not a de Polignac number, because 256164403 - 2¹³ = 256156211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256167403) 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 15 ways as a sum of consecutive naturals, for example, 27501 + ... + 35617.

It is an arithmetic number, because the mean of its divisors is an integer number (18509040).

Almost surely, 2^256164403 is an apocalyptic number.

256164403 is a deficient number, since it is larger than the sum of its proper divisors (39980237).

256164403 is a wasteful number, since it uses less digits than its factorization.

256164403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8298.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 256164403 is about 16005.1367691751. The cubic root of 256164403 is about 635.0963153963.

The spelling of 256164403 in words is "two hundred fifty-six million, one hundred sixty-four thousand, four hundred three".