256563011 has 4 divisors (see below), whose sum is σ = 260769024. Its totient is φ = 252357000.

The previous prime is 256562993. The next prime is 256563049. The reversal of 256563011 is 110365652.

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

It is not a de Polignac number, because 256563011 - 2¹⁴ = 256546627 is a prime.

It is a super-2 number, since 2×256563011² = 131649157226772242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256563311) 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, 2102915 + ... + 2103036.

It is an arithmetic number, because the mean of its divisors is an integer number (65192256).

Almost surely, 2^256563011 is an apocalyptic number.

256563011 is a deficient number, since it is larger than the sum of its proper divisors (4206013).

256563011 is an equidigital number, since it uses as much as digits as its factorization.

256563011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4206012.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 256563011 is about 16017.5844308685. The cubic root of 256563011 is about 635.4255613473.

The spelling of 256563011 in words is "two hundred fifty-six million, five hundred sixty-three thousand, eleven".