663602881 has 8 divisors (see below), whose sum is σ = 683727464. Its totient is φ = 643593600.

The previous prime is 663602879. The next prime is 663602887. The reversal of 663602881 is 188206366.

663602881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 4910656 + 658692225 = 2216^2 + 25665^2 .

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 663602881 - 2¹ = 663602879 is a prime.

It is a super-2 number, since 2×663602881² = 880737567343000322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663602887) 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, 17070 + ... + 40231.

It is an arithmetic number, because the mean of its divisors is an integer number (85465933).

Almost surely, 2^663602881 is an apocalyptic number.

It is an amenable number.

663602881 is a deficient number, since it is larger than the sum of its proper divisors (20124583).

663602881 is a wasteful number, since it uses less digits than its factorization.

663602881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57651.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 663602881 is about 25760.4906979661. The cubic root of 663602881 is about 872.2401778054.

The spelling of 663602881 in words is "six hundred sixty-three million, six hundred two thousand, eight hundred eighty-one".