63581663 has 2 divisors, whose sum is σ = 63581664. Its totient is φ = 63581662.

The previous prime is 63581653. The next prime is 63581671. The reversal of 63581663 is 36618536.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63581663 - 2⁶ = 63581599 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63581603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31790831 + 31790832.

It is an arithmetic number, because the mean of its divisors is an integer number (31790832).

Almost surely, 2^63581663 is an apocalyptic number.

63581663 is a deficient number, since it is larger than the sum of its proper divisors (1).

63581663 is an equidigital number, since it uses as much as digits as its factorization.

63581663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 38.

The square root of 63581663 is about 7973.8110712507. The cubic root of 63581663 is about 399.1265587224.

The spelling of 63581663 in words is "sixty-three million, five hundred eighty-one thousand, six hundred sixty-three".