256163555 has 8 divisors (see below), whose sum is σ = 309355152. Its totient is φ = 203624928.

The previous prime is 256163549. The next prime is 256163561. The reversal of 256163555 is 555361652.

It is an interprime number because it is at equal distance from previous prime (256163549) and next prime (256163561).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256163555 - 2¹⁶ = 256098019 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 162377 + ... + 163946.

It is an arithmetic number, because the mean of its divisors is an integer number (38669394).

Almost surely, 2^256163555 is an apocalyptic number.

256163555 is a deficient number, since it is larger than the sum of its proper divisors (53191597).

256163555 is a wasteful number, since it uses less digits than its factorization.

256163555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326485.

The product of its digits is 135000, while the sum is 38.

The square root of 256163555 is about 16005.1102776582. The cubic root of 256163555 is about 635.0956145934.

The spelling of 256163555 in words is "two hundred fifty-six million, one hundred sixty-three thousand, five hundred fifty-five".