16582317921 has 16 divisors (see below), whose sum is σ = 26456120320. Its totient is φ = 10204503120.

The previous prime is 16582317901. The next prime is 16582317949. The reversal of 16582317921 is 12971328561.

16582317921 is a `hidden beast` number, since 16 + 582 + 31 + 7 + 9 + 21 = 666.

16582317921 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 16582317921 - 2²³ = 16573929313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16582317901) 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, 23621185 + ... + 23621886.

It is an arithmetic number, because the mean of its divisors is an integer number (1653507520).

Almost surely, 2^16582317921 is an apocalyptic number.

It is an amenable number.

16582317921 is a deficient number, since it is larger than the sum of its proper divisors (9873802399).

16582317921 is a wasteful number, since it uses less digits than its factorization.

16582317921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47243093 (or 47243087 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The spelling of 16582317921 in words is "sixteen billion, five hundred eighty-two million, three hundred seventeen thousand, nine hundred twenty-one".