663900049 has 4 divisors (see below), whose sum is σ = 664317364. Its totient is φ = 663482736.

The previous prime is 663900023. The next prime is 663900077. The reversal of 663900049 is 940009366.

663900049 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 940009366 = 2 ⋅470004683.

It can be written as a sum of positive squares in 2 ways, for example, as 396806400 + 267093649 = 19920^2 + 16343^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663900049 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 663899990 and 663900017.

It is not an unprimeable number, because it can be changed into a prime (663900079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206262 + ... + 209455.

It is an arithmetic number, because the mean of its divisors is an integer number (166079341).

Almost surely, 2^663900049 is an apocalyptic number.

It is an amenable number.

663900049 is a deficient number, since it is larger than the sum of its proper divisors (417315).

663900049 is a wasteful number, since it uses less digits than its factorization.

663900049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417314.

The product of its (nonzero) digits is 34992, while the sum is 37.

The square root of 663900049 is about 25766.2579549301. The cubic root of 663900049 is about 872.3703576641.

The spelling of 663900049 in words is "six hundred sixty-three million, nine hundred thousand, forty-nine".