56639663 has 2 divisors, whose sum is σ = 56639664. Its totient is φ = 56639662.

The previous prime is 56639651. The next prime is 56639707. The reversal of 56639663 is 36693665.

It is an a-pointer prime, because the next prime (56639707) can be obtained adding 56639663 to its sum of digits (44).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56639663 - 2¹⁴ = 56623279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56639623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28319831 + 28319832.

It is an arithmetic number, because the mean of its divisors is an integer number (28319832).

Almost surely, 2^56639663 is an apocalyptic number.

56639663 is a deficient number, since it is larger than the sum of its proper divisors (1).

56639663 is an equidigital number, since it uses as much as digits as its factorization.

56639663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 524880, while the sum is 44.

The square root of 56639663 is about 7525.9326996725. The cubic root of 56639663 is about 384.0374289869.

The spelling of 56639663 in words is "fifty-six million, six hundred thirty-nine thousand, six hundred sixty-three".