663686773 has 8 divisors (see below), whose sum is σ = 669283992. Its totient is φ = 658100736.

The previous prime is 663686759. The next prime is 663686801. The reversal of 663686773 is 377686366.

It can be written as a sum of positive squares in 4 ways, for example, as 23444964 + 640241809 = 4842^2 + 25303^2 .

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 663686773 - 2¹³ = 663678581 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 663686773.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663686743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150861 + ... + 155197.

It is an arithmetic number, because the mean of its divisors is an integer number (83660499).

Almost surely, 2^663686773 is an apocalyptic number.

It is an amenable number.

663686773 is a deficient number, since it is larger than the sum of its proper divisors (5597219).

663686773 is a wasteful number, since it uses less digits than its factorization.

663686773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5591.

The product of its digits is 4572288, while the sum is 52.

The square root of 663686773 is about 25762.1189539991. The cubic root of 663686773 is about 872.2769321615.

The spelling of 663686773 in words is "six hundred sixty-three million, six hundred eighty-six thousand, seven hundred seventy-three".