663495949 has 4 divisors (see below), whose sum is σ = 663735964. Its totient is φ = 663255936.

The previous prime is 663495893. The next prime is 663495961. The reversal of 663495949 is 949594366.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 496621225 + 166874724 = 22285^2 + 12918^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663495949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 663495949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663495149) 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 in 3 ways as a sum of consecutive naturals, for example, 115812 + ... + 121405.

It is an arithmetic number, because the mean of its divisors is an integer number (165933991).

Almost surely, 2^663495949 is an apocalyptic number.

It is an amenable number.

663495949 is a deficient number, since it is larger than the sum of its proper divisors (240015).

663495949 is a wasteful number, since it uses less digits than its factorization.

663495949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240014.

The product of its digits is 6298560, while the sum is 55.

The square root of 663495949 is about 25758.4151104062. The cubic root of 663495949 is about 872.1933247855.

The spelling of 663495949 in words is "six hundred sixty-three million, four hundred ninety-five thousand, nine hundred forty-nine".