663443623 has 2 divisors, whose sum is σ = 663443624. Its totient is φ = 663443622.

The previous prime is 663443569. The next prime is 663443699. The reversal of 663443623 is 326344366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 663443623 - 2⁹ = 663443111 is a prime.

It is a super-2 number, since 2×663443623² = 880314881798732258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663443423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331721811 + 331721812.

It is an arithmetic number, because the mean of its divisors is an integer number (331721812).

Almost surely, 2^663443623 is an apocalyptic number.

663443623 is a deficient number, since it is larger than the sum of its proper divisors (1).

663443623 is an equidigital number, since it uses as much as digits as its factorization.

663443623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 37.

The square root of 663443623 is about 25757.3993834781. The cubic root of 663443623 is about 872.1703959403.

Adding to 663443623 its reverse (326344366), we get a palindrome (989787989).

The spelling of 663443623 in words is "six hundred sixty-three million, four hundred forty-three thousand, six hundred twenty-three".