16621449992 has 96 divisors (see below), whose sum is σ = 37589572800. Its totient is φ = 6747057408.

The previous prime is 16621449989. The next prime is 16621450019. The reversal of 16621449992 is 29994412661.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2492759 + ... + 2499417.

It is an arithmetic number, because the mean of its divisors is an integer number (391558050).

Almost surely, 2^16621449992 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 16621449992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18794786400).

16621449992 is an abundant number, since it is smaller than the sum of its proper divisors (20968122808).

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

16621449992 is a wasteful number, since it uses less digits than its factorization.

16621449992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6783 (or 6750 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 53.

The spelling of 16621449992 in words is "sixteen billion, six hundred twenty-one million, four hundred forty-nine thousand, nine hundred ninety-two".