256536663 has 4 divisors (see below), whose sum is σ = 342048888. Its totient is φ = 171024440.

The previous prime is 256536619. The next prime is 256536677. The reversal of 256536663 is 366635652.

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 256536663 - 2¹⁴ = 256520279 is a prime.

It is a super-2 number, since 2×256536663² = 131622118926351138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256531663) 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, 42756108 + ... + 42756113.

It is an arithmetic number, because the mean of its divisors is an integer number (85512222).

Almost surely, 2^256536663 is an apocalyptic number.

256536663 is a deficient number, since it is larger than the sum of its proper divisors (85512225).

256536663 is an equidigital number, since it uses as much as digits as its factorization.

256536663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85512224.

The product of its digits is 583200, while the sum is 42.

The square root of 256536663 is about 16016.7619386691. The cubic root of 256536663 is about 635.4038087106.

The spelling of 256536663 in words is "two hundred fifty-six million, five hundred thirty-six thousand, six hundred sixty-three".