56005663 has 4 divisors (see below), whose sum is σ = 64006480. Its totient is φ = 48004848.

The previous prime is 56005657. The next prime is 56005669. The reversal of 56005663 is 36650065.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36650065 = 5 ⋅7330013.

It is an interprime number because it is at equal distance from previous prime (56005657) and next prime (56005669).

It is a cyclic number.

It is not a de Polignac number, because 56005663 - 2¹³ = 55997471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56005669) 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, 4000398 + ... + 4000411.

It is an arithmetic number, because the mean of its divisors is an integer number (16001620).

Almost surely, 2^56005663 is an apocalyptic number.

56005663 is a deficient number, since it is larger than the sum of its proper divisors (8000817).

56005663 is an equidigital number, since it uses as much as digits as its factorization.

56005663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8000816.

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 56005663 is about 7483.6931390858. The cubic root of 56005663 is about 382.5991324642.

The spelling of 56005663 in words is "fifty-six million, five thousand, six hundred sixty-three".