208161601616 has 20 divisors (see below), whose sum is σ = 404329017492. Its totient is φ = 103818629376.

The previous prime is 208161601607. The next prime is 208161601619. The reversal of 208161601616 is 616106161802.

208161601616 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 2 ways, for example, as 169328958016 + 38832643600 = 411496^2 + 197060^2 .

It is a super-2 number, since 2×208161601616² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 208161601616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208161601619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16379165 + ... + 16391868.

Almost surely, 2^208161601616 is an apocalyptic number.

It is an amenable number.

208161601616 is a deficient number, since it is larger than the sum of its proper divisors (196167415876).

208161601616 is a wasteful number, since it uses less digits than its factorization.

208161601616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32771438 (or 32771432 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 38.

The spelling of 208161601616 in words is "two hundred eight billion, one hundred sixty-one million, six hundred one thousand, six hundred sixteen".