168665416 has 8 divisors (see below), whose sum is σ = 316247670. Its totient is φ = 84332704.

The previous prime is 168665383. The next prime is 168665423. The reversal of 168665416 is 614566861.

It can be written as a sum of positive squares in only one way, i.e., 105144516 + 63520900 = 10254^2 + 7970^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10541581 + ... + 10541596.

Almost surely, 2^168665416 is an apocalyptic number.

It is an amenable number.

168665416 is a deficient number, since it is larger than the sum of its proper divisors (147582254).

168665416 is a wasteful number, since it uses less digits than its factorization.

168665416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21083183 (or 21083179 counting only the distinct ones).

The product of its digits is 207360, while the sum is 43.

The square root of 168665416 is about 12987.1250090234. The cubic root of 168665416 is about 552.5123804410.

The spelling of 168665416 in words is "one hundred sixty-eight million, six hundred sixty-five thousand, four hundred sixteen".