16661535984 has 240 divisors, whose sum is σ = 51788685312. Its totient is φ = 4973709312.

The previous prime is 16661535977. The next prime is 16661536013. The reversal of 16661535984 is 48953516661.

It is a super-2 number, since 2×16661535984² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16661535984.

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, 12555129 + ... + 12556455.

Almost surely, 2^16661535984 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 16661535984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25894342656).

16661535984 is an abundant number, since it is smaller than the sum of its proper divisors (35127149328).

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

16661535984 is a wasteful number, since it uses less digits than its factorization.

16661535984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1604 (or 1595 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 54.

The spelling of 16661535984 in words is "sixteen billion, six hundred sixty-one million, five hundred thirty-five thousand, nine hundred eighty-four".