256463663 has 4 divisors (see below), whose sum is σ = 256914960. Its totient is φ = 256012368.

The previous prime is 256463659. The next prime is 256463671. The reversal of 256463663 is 366364652.

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 256463663 - 2² = 256463659 is a prime.

It is a super-2 number, since 2×256463663² = 131547220878755138, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256463663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256463563) 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, 224795 + ... + 225932.

It is an arithmetic number, because the mean of its divisors is an integer number (64228740).

Almost surely, 2^256463663 is an apocalyptic number.

256463663 is a deficient number, since it is larger than the sum of its proper divisors (451297).

256463663 is an equidigital number, since it uses as much as digits as its factorization.

256463663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451296.

The product of its digits is 466560, while the sum is 41.

The square root of 256463663 is about 16014.4829139126. The cubic root of 256463663 is about 635.3435328838.

The spelling of 256463663 in words is "two hundred fifty-six million, four hundred sixty-three thousand, six hundred sixty-three".