663891011 has 8 divisors (see below), whose sum is σ = 760986720. Its totient is φ = 567358848.

The previous prime is 663891001. The next prime is 663891017. The reversal of 663891011 is 110198366.

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

It is not a de Polignac number, because 663891011 - 2¹⁰ = 663889987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (663891017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138356 + ... + 143073.

It is an arithmetic number, because the mean of its divisors is an integer number (95123340).

Almost surely, 2^663891011 is an apocalyptic number.

663891011 is a deficient number, since it is larger than the sum of its proper divisors (97095709).

663891011 is a wasteful number, since it uses less digits than its factorization.

663891011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281773.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 663891011 is about 25766.0825699213. The cubic root of 663891011 is about 872.3663989763.

The spelling of 663891011 in words is "six hundred sixty-three million, eight hundred ninety-one thousand, eleven".