16721525724 has 12 divisors (see below), whose sum is σ = 39016893384. Its totient is φ = 5573841904.

The previous prime is 16721525693. The next prime is 16721525747. The reversal of 16721525724 is 42752512761.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 696730227 + ... + 696730250.

It is an arithmetic number, because the mean of its divisors is an integer number (3251407782).

Almost surely, 2^16721525724 is an apocalyptic number.

It is an amenable number.

16721525724 is an abundant number, since it is smaller than the sum of its proper divisors (22295367660).

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

16721525724 is a wasteful number, since it uses less digits than its factorization.

16721525724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393460484 (or 1393460482 counting only the distinct ones).

The product of its digits is 235200, while the sum is 42.

The spelling of 16721525724 in words is "sixteen billion, seven hundred twenty-one million, five hundred twenty-five thousand, seven hundred twenty-four".