16651544664 has 64 divisors (see below), whose sum is σ = 42482361600. Its totient is φ = 5437051776.

The previous prime is 16651544647. The next prime is 16651544677. The reversal of 16651544664 is 46644515661.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 807717 + ... + 828075.

It is an arithmetic number, because the mean of its divisors is an integer number (663786900).

Almost surely, 2^16651544664 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 16651544664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21241180800).

16651544664 is an abundant number, since it is smaller than the sum of its proper divisors (25830816936).

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

16651544664 is a wasteful number, since it uses less digits than its factorization.

16651544664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21064 (or 21060 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 48.

The spelling of 16651544664 in words is "sixteen billion, six hundred fifty-one million, five hundred forty-four thousand, six hundred sixty-four".