663710849 has 4 divisors (see below), whose sum is σ = 686597460. Its totient is φ = 640824240.

The previous prime is 663710833. The next prime is 663710857. The reversal of 663710849 is 948017366.

663710849 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.

It can be written as a sum of positive squares in 2 ways, for example, as 315701824 + 348009025 = 17768^2 + 18655^2 .

It is a cyclic number.

It is not a de Polignac number, because 663710849 - 2⁴ = 663710833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663710249) 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, 11443262 + ... + 11443319.

It is an arithmetic number, because the mean of its divisors is an integer number (171649365).

Almost surely, 2^663710849 is an apocalyptic number.

It is an amenable number.

663710849 is a deficient number, since it is larger than the sum of its proper divisors (22886611).

663710849 is a wasteful number, since it uses less digits than its factorization.

663710849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22886610.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 663710849 is about 25762.5862249891. The cubic root of 663710849 is about 872.2874796498.

The spelling of 663710849 in words is "six hundred sixty-three million, seven hundred ten thousand, eight hundred forty-nine".