63999641 has 2 divisors, whose sum is σ = 63999642. Its totient is φ = 63999640.

The previous prime is 63999599. The next prime is 63999643. The reversal of 63999641 is 14699936.

63999641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60777616 + 3222025 = 7796^2 + 1795^2 .

It is a cyclic number.

It is not a de Polignac number, because 63999641 - 2¹⁰ = 63998617 is a prime.

Together with 63999643, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (63999643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31999820 + 31999821.

It is an arithmetic number, because the mean of its divisors is an integer number (31999821).

Almost surely, 2^63999641 is an apocalyptic number.

It is an amenable number.

63999641 is a deficient number, since it is larger than the sum of its proper divisors (1).

63999641 is an equidigital number, since it uses as much as digits as its factorization.

63999641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 47.

The square root of 63999641 is about 7999.9775624685. The cubic root of 63999641 is about 399.9992520819. Note that the first 3 decimals are identical.

The spelling of 63999641 in words is "sixty-three million, nine hundred ninety-nine thousand, six hundred forty-one".