663549945366 has 96 divisors (see below), whose sum is σ = 1667517755904. Its totient is φ = 172307520000.

The previous prime is 663549945239. The next prime is 663549945379.

663549945366 is nontrivially palindromic in base 10.

663549945366 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a junction number, because it is equal to n+sod(n) for n = 663549945297 and 663549945306.

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, 23683366 + ... + 23711366.

It is an arithmetic number, because the mean of its divisors is an integer number (17369976624).

Almost surely, 2^663549945366 is an apocalyptic number.

663549945366 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 663549945366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (833758877952).

663549945366 is an abundant number, since it is smaller than the sum of its proper divisors (1003967810538).

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

663549945366 is a wasteful number, since it uses less digits than its factorization.

663549945366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32698 (or 32687 counting only the distinct ones).

The product of its digits is 377913600, while the sum is 66.

The spelling of 663549945366 in words is "six hundred sixty-three billion, five hundred forty-nine million, nine hundred forty-five thousand, three hundred sixty-six".