663558747855366 has 96 divisors (see below), whose sum is σ = 1477905497349120. Its totient is φ = 198437947868160.

The previous prime is 663558747855281. The next prime is 663558747855371.

663558747855366 is nontrivially palindromic in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 116925990 + ... + 122469606.

It is an arithmetic number, because the mean of its divisors is an integer number (15394848930720).

Almost surely, 2^{663558747855366} is an apocalyptic number.

663558747855366 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 663558747855366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (738952748674560).

663558747855366 is an abundant number, since it is smaller than the sum of its proper divisors (814346749493754).

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

663558747855366 is a wasteful number, since it uses less digits than its factorization.

663558747855366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5545810 (or 5545799 counting only the distinct ones).

The product of its digits is 91445760000, while the sum is 84.

The spelling of 663558747855366 in words is "six hundred sixty-three trillion, five hundred fifty-eight billion, seven hundred forty-seven million, eight hundred fifty-five thousand, three hundred sixty-six".