208161616 has 20 divisors (see below), whose sum is σ = 434337652. Its totient is φ = 96074496.

The previous prime is 208161601. The next prime is 208161619. The reversal of 208161616 is 616161802.

It can be written as a sum of positive squares in 2 ways, for example, as 104121616 + 104040000 = 10204^2 + 10200^2 .

208161616 is a modest number, since divided by 161616 gives 208 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208161619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500181 + ... + 500596.

Almost surely, 2^208161616 is an apocalyptic number.

208161616 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

208161616 is an abundant number, since it is smaller than the sum of its proper divisors (226176036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

208161616 is a wasteful number, since it uses less digits than its factorization.

208161616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000798 (or 1000792 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 208161616 is about 14427.8070405727. The cubic root of 208161616 is about 592.6526312495.

The spelling of 208161616 in words is "two hundred eight million, one hundred sixty-one thousand, six hundred sixteen".