663247633 has 2 divisors, whose sum is σ = 663247634. Its totient is φ = 663247632.

The previous prime is 663247601. The next prime is 663247643. The reversal of 663247633 is 336742366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 512252689 + 150994944 = 22633^2 + 12288^2 .

It is a cyclic number.

It is not a de Polignac number, because 663247633 - 2⁵ = 663247601 is a prime.

It is not a weakly prime, because it can be changed into another prime (663247643) 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, 331623816 + 331623817.

It is an arithmetic number, because the mean of its divisors is an integer number (331623817).

Almost surely, 2^663247633 is an apocalyptic number.

It is an amenable number.

663247633 is a deficient number, since it is larger than the sum of its proper divisors (1).

663247633 is an equidigital number, since it uses as much as digits as its factorization.

663247633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 326592, while the sum is 40.

The square root of 663247633 is about 25753.5945646428. The cubic root of 663247633 is about 872.0845039343.

Adding to 663247633 its reverse (336742366), we get a palindrome (999989999).

The spelling of 663247633 in words is "six hundred sixty-three million, two hundred forty-seven thousand, six hundred thirty-three".