16663442439744 has 189 divisors, whose sum is σ = 48397472978673. Its totient is φ = 5481623706624.

The previous prime is 16663442439647. The next prime is 16663442439779. The reversal of 16663442439744 is 44793424436661.

The square root of 16663442439744 is 4082088.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1230235905600 + 15433206534144 = 1109160^2 + 3928512^2 .

It is a super-2 number, since 2×16663442439744² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 7739637772 + ... + 7739639924.

Almost surely, 2^{16663442439744} is an apocalyptic number.

16663442439744 is the 4082088-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16663442439744

16663442439744 is an abundant number, since it is smaller than the sum of its proper divisors (31734030538929).

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

16663442439744 is an frugal number, since it uses more digits than its factorization.

16663442439744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4482 (or 2237 counting only the distinct ones).

The product of its digits is 250822656, while the sum is 63.

The spelling of 16663442439744 in words is "sixteen trillion, six hundred sixty-three billion, four hundred forty-two million, four hundred thirty-nine thousand, seven hundred forty-four".