16721460644 has 96 divisors (see below), whose sum is σ = 38894929920. Its totient is φ = 6111908352.

The previous prime is 16721460641. The next prime is 16721460649. The reversal of 16721460644 is 44606412761.

It is not an unprimeable number, because it can be changed into a prime (16721460641) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 167819 + ... + 248205.

It is an arithmetic number, because the mean of its divisors is an integer number (405155520).

Almost surely, 2^16721460644 is an apocalyptic number.

16721460644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16721460644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19447464960).

16721460644 is an abundant number, since it is smaller than the sum of its proper divisors (22173469276).

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

16721460644 is a wasteful number, since it uses less digits than its factorization.

16721460644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80457 (or 80455 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 41.

The spelling of 16721460644 in words is "sixteen billion, seven hundred twenty-one million, four hundred sixty thousand, six hundred forty-four".