16725721611 has 16 divisors (see below), whose sum is σ = 22467178368. Its totient is φ = 11067672000.

The previous prime is 16725721561. The next prime is 16725721619. The reversal of 16725721611 is 11612752761.

16725721611 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16725721611 - 2¹⁸ = 16725459467 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16725721611.

It is not an unprimeable number, because it can be changed into a prime (16725721619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 188311 + ... + 262511.

It is an arithmetic number, because the mean of its divisors is an integer number (1404198648).

Almost surely, 2^16725721611 is an apocalyptic number.

16725721611 is a deficient number, since it is larger than the sum of its proper divisors (5741456757).

16725721611 is a wasteful number, since it uses less digits than its factorization.

16725721611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74762.

The product of its digits is 35280, while the sum is 39.

The spelling of 16725721611 in words is "sixteen billion, seven hundred twenty-five million, seven hundred twenty-one thousand, six hundred eleven".