663945764 has 6 divisors (see below), whose sum is σ = 1161905094. Its totient is φ = 331972880.

The previous prime is 663945743. The next prime is 663945767. The reversal of 663945764 is 467549366.

It can be written as a sum of positive squares in only one way, i.e., 661518400 + 2427364 = 25720^2 + 1558^2 .

It is not an unprimeable number, because it can be changed into a prime (663945767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82993217 + ... + 82993224.

It is an arithmetic number, because the mean of its divisors is an integer number (193650849).

Almost surely, 2^663945764 is an apocalyptic number.

It is an amenable number.

663945764 is a deficient number, since it is larger than the sum of its proper divisors (497959330).

663945764 is a wasteful number, since it uses less digits than its factorization.

663945764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165986445 (or 165986443 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 50.

The square root of 663945764 is about 25767.1450494617. The cubic root of 663945764 is about 872.3903805052.

The spelling of 663945764 in words is "six hundred sixty-three million, nine hundred forty-five thousand, seven hundred sixty-four".