663207813 has 12 divisors (see below), whose sum is σ = 958780108. Its totient is φ = 441763200.

The previous prime is 663207773. The next prime is 663207823. The reversal of 663207813 is 318702366.

It is a happy number.

663207813 is a `hidden beast` number, since 6 + 632 + 0 + 7 + 8 + 13 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 267715044 + 395492769 = 16362^2 + 19887^2 .

It is not a de Polignac number, because 663207813 - 2⁹ = 663207301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663207823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19870 + ... + 41487.

Almost surely, 2^663207813 is an apocalyptic number.

It is an amenable number.

663207813 is a deficient number, since it is larger than the sum of its proper divisors (295572295).

663207813 is a wasteful number, since it uses less digits than its factorization.

663207813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62564 (or 62561 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 663207813 is about 25752.8214570753. The cubic root of 663207813 is about 872.0670508754.

The spelling of 663207813 in words is "six hundred sixty-three million, two hundred seven thousand, eight hundred thirteen".