16618121 has 8 divisors (see below), whose sum is σ = 18674880. Its totient is φ = 14672592.

The previous prime is 16618111. The next prime is 16618157. The reversal of 16618121 is 12181661.

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

It is a cyclic number.

It is not a de Polignac number, because 16618121 - 2¹⁴ = 16601737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16618111) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 27491 + ... + 28088.

It is an arithmetic number, because the mean of its divisors is an integer number (2334360).

Almost surely, 2^16618121 is an apocalyptic number.

It is an amenable number.

16618121 is a deficient number, since it is larger than the sum of its proper divisors (2056759).

16618121 is a wasteful number, since it uses less digits than its factorization.

16618121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55615.

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

The square root of 16618121 is about 4076.5329631931. The cubic root of 16618121 is about 255.1882295993.

Adding to 16618121 its reverse (12181661), we get a palindrome (28799782).

The spelling of 16618121 in words is "sixteen million, six hundred eighteen thousand, one hundred twenty-one".