8161616 has 10 divisors (see below), whose sum is σ = 15813162. Its totient is φ = 4080800.

The previous prime is 8161607. The next prime is 8161627. The reversal of 8161616 is 6161618.

It can be written as a sum of positive squares in only one way, i.e., 5271616 + 2890000 = 2296^2 + 1700^2 .

It is a super-2 number, since 2×8161616² = 133223951462912, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

8161616 is a modest number, since divided by 1616 gives 816 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255035 + ... + 255066.

Almost surely, 2^8161616 is an apocalyptic number.

It is an amenable number.

8161616 is a deficient number, since it is larger than the sum of its proper divisors (7651546).

8161616 is a wasteful number, since it uses less digits than its factorization.

8161616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510109 (or 510103 counting only the distinct ones).

The product of its digits is 1728, while the sum is 29.

The square root of 8161616 is about 2856.8542139913. The cubic root of 8161616 is about 201.3378310863.

The spelling of 8161616 in words is "eight million, one hundred sixty-one thousand, six hundred sixteen".