16678161 has 12 divisors (see below), whose sum is σ = 24921780. Its totient is φ = 10735200.

The previous prime is 16678159. The next prime is 16678163. The reversal of 16678161 is 16187661.

It is an interprime number because it is at equal distance from previous prime (16678159) and next prime (16678163).

It can be written as a sum of positive squares in 2 ways, for example, as 12852225 + 3825936 = 3585^2 + 1956^2 .

It is not a de Polignac number, because 16678161 - 2¹ = 16678159 is a prime.

It is a super-2 number, since 2×16678161² = 556322108683842, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (16678163) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31690 + ... + 32211.

It is an arithmetic number, because the mean of its divisors is an integer number (2076815).

Almost surely, 2^16678161 is an apocalyptic number.

It is an amenable number.

16678161 is a deficient number, since it is larger than the sum of its proper divisors (8243619).

16678161 is a wasteful number, since it uses less digits than its factorization.

16678161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63936 (or 63933 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 16678161 is about 4083.8904245829. The cubic root of 16678161 is about 255.4951854108.

The spelling of 16678161 in words is "sixteen million, six hundred seventy-eight thousand, one hundred sixty-one".