16720333717 has 4 divisors (see below), whose sum is σ = 16851990016. Its totient is φ = 16588677420.

The previous prime is 16720333703. The next prime is 16720333723. The reversal of 16720333717 is 71733302761.

16720333717 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71733302761 = 937 ⋅76556353.

It is a cyclic number.

It is not a de Polignac number, because 16720333717 - 2²³ = 16711945109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16720333717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16720331717) 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 3 ways as a sum of consecutive naturals, for example, 65827959 + ... + 65828212.

It is an arithmetic number, because the mean of its divisors is an integer number (4212997504).

Almost surely, 2^16720333717 is an apocalyptic number.

It is an amenable number.

16720333717 is a deficient number, since it is larger than the sum of its proper divisors (131656299).

16720333717 is a wasteful number, since it uses less digits than its factorization.

16720333717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131656298.

The product of its (nonzero) digits is 111132, while the sum is 40.

The spelling of 16720333717 in words is "sixteen billion, seven hundred twenty million, three hundred thirty-three thousand, seven hundred seventeen".