16161218 has 8 divisors (see below), whose sum is σ = 24639420. Its totient is φ = 7948080.

The previous prime is 16161209. The next prime is 16161253. The reversal of 16161218 is 81216161.

It can be written as a sum of positive squares in 2 ways, for example, as 14845609 + 1315609 = 3853^2 + 1147^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×16161218² = 522369934487048, which contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66113 + ... + 66356.

Almost surely, 2^16161218 is an apocalyptic number.

16161218 is a deficient number, since it is larger than the sum of its proper divisors (8478202).

16161218 is a wasteful number, since it uses less digits than its factorization.

16161218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132532.

The product of its digits is 576, while the sum is 26.

The square root of 16161218 is about 4020.1017400061. The cubic root of 16161218 is about 252.8277246372.

Adding to 16161218 its reverse (81216161), we get a palindrome (97377379).

The spelling of 16161218 in words is "sixteen million, one hundred sixty-one thousand, two hundred eighteen".