663643074643 has 2 divisors, whose sum is σ = 663643074644. Its totient is φ = 663643074642.

The previous prime is 663643074631. The next prime is 663643074649. The reversal of 663643074643 is 346470346366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 663643074643 - 2³⁷ = 526204121171 is a prime.

It is a super-2 number, since 2×663643074643² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (663643074649) 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, 331821537321 + 331821537322.

It is an arithmetic number, because the mean of its divisors is an integer number (331821537322).

Almost surely, 2^663643074643 is an apocalyptic number.

663643074643 is a deficient number, since it is larger than the sum of its proper divisors (1).

663643074643 is an equidigital number, since it uses as much as digits as its factorization.

663643074643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15676416, while the sum is 52.

The spelling of 663643074643 in words is "six hundred sixty-three billion, six hundred forty-three million, seventy-four thousand, six hundred forty-three".