16543980657 has 6 divisors (see below), whose sum is σ = 23896860962. Its totient is φ = 11029320432.

The previous prime is 16543980641. The next prime is 16543980709. The reversal of 16543980657 is 75608934561.

16543980657 is a `hidden beast` number, since 1 + 6 + 543 + 98 + 0 + 6 + 5 + 7 = 666.

16543980657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 11510929521 + 5033051136 = 107289^2 + 70944^2 .

It is not a de Polignac number, because 16543980657 - 2⁴ = 16543980641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16543980757) 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 5 ways as a sum of consecutive naturals, for example, 919110028 + ... + 919110045.

Almost surely, 2^16543980657 is an apocalyptic number.

It is an amenable number.

16543980657 is a deficient number, since it is larger than the sum of its proper divisors (7352880305).

16543980657 is a wasteful number, since it uses less digits than its factorization.

16543980657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1838220079 (or 1838220076 counting only the distinct ones).

The product of its (nonzero) digits is 5443200, while the sum is 54.

The spelling of 16543980657 in words is "sixteen billion, five hundred forty-three million, nine hundred eighty thousand, six hundred fifty-seven".