663579890000 has 100 divisors (see below), whose sum is σ = 1607055968100. Its totient is φ = 265355520000.

The previous prime is 663579889979. The next prime is 663579890027. The reversal of 663579890000 is 98975366.

It can be written as a sum of positive squares in 10 ways, for example, as 451191637264 + 212388252736 = 671708^2 + 460856^2 .

It is a tau number, because it is divible by the number of its divisors (100).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 45602726 + ... + 45617274.

It is an arithmetic number, because the mean of its divisors is an integer number (16070559681).

Almost surely, 2^663579890000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 663579890000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (803527984050).

663579890000 is an abundant number, since it is smaller than the sum of its proper divisors (943476078100).

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

663579890000 is a wasteful number, since it uses less digits than its factorization.

663579890000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19138 (or 19117 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 53.

The spelling of 663579890000 in words is "six hundred sixty-three billion, five hundred seventy-nine million, eight hundred ninety thousand".