663399811 has 8 divisors (see below), whose sum is σ = 666051120. Its totient is φ = 660754848.

The previous prime is 663399809. The next prime is 663399871. The reversal of 663399811 is 118993366.

663399811 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 663399811 - 2¹ = 663399809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663399871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 325945 + ... + 327973.

It is an arithmetic number, because the mean of its divisors is an integer number (83256390).

Almost surely, 2^663399811 is an apocalyptic number.

663399811 is a deficient number, since it is larger than the sum of its proper divisors (2651309).

663399811 is a wasteful number, since it uses less digits than its factorization.

663399811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3173.

The product of its digits is 209952, while the sum is 46.

The square root of 663399811 is about 25756.5488953780. The cubic root of 663399811 is about 872.1511969362.

The spelling of 663399811 in words is "six hundred sixty-three million, three hundred ninety-nine thousand, eight hundred eleven".