663664787466366 has 128 divisors (see below), whose sum is σ = 1588187535068160. Its totient is φ = 180879100416000.

The previous prime is 663664787466323. The next prime is 663664787466367.

663664787466366 is nontrivially palindromic in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663664787466367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 51673326 + ... + 63225486.

It is an arithmetic number, because the mean of its divisors is an integer number (12407715117720).

Almost surely, 2^{663664787466366} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663664787466366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (794093767534080).

663664787466366 is an abundant number, since it is smaller than the sum of its proper divisors (924522747601794).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

663664787466366 is a wasteful number, since it uses less digits than its factorization.

663664787466366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11552770.

The product of its digits is 94810963968, while the sum is 84.

The spelling of 663664787466366 in words is "six hundred sixty-three trillion, six hundred sixty-four billion, seven hundred eighty-seven million, four hundred sixty-six thousand, three hundred sixty-six".