16216661 has 8 divisors (see below), whose sum is σ = 16461984. Its totient is φ = 15973200.

The previous prime is 16216639. The next prime is 16216663. The reversal of 16216661 is 16661261.

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 16216661 - 2²² = 12022357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16216663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30746 + ... + 31268.

It is an arithmetic number, because the mean of its divisors is an integer number (2057748).

Almost surely, 2^16216661 is an apocalyptic number.

It is an amenable number.

16216661 is a deficient number, since it is larger than the sum of its proper divisors (245323).

16216661 is a wasteful number, since it uses less digits than its factorization.

16216661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931.

The product of its digits is 2592, while the sum is 29.

The square root of 16216661 is about 4026.9915569815. The cubic root of 16216661 is about 253.1165132754.

The spelling of 16216661 in words is "sixteen million, two hundred sixteen thousand, six hundred sixty-one".