216224661 has 16 divisors (see below), whose sum is σ = 291202560. Its totient is φ = 142706160.

The previous prime is 216224653. The next prime is 216224663. The reversal of 216224661 is 166422612.

It is not a de Polignac number, because 216224661 - 2³ = 216224653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216224663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140466 + ... + 141996.

It is an arithmetic number, because the mean of its divisors is an integer number (18200160).

Almost surely, 2^216224661 is an apocalyptic number.

It is an amenable number.

216224661 is a deficient number, since it is larger than the sum of its proper divisors (74977899).

216224661 is a wasteful number, since it uses less digits than its factorization.

216224661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1976.

The product of its digits is 6912, while the sum is 30.

The square root of 216224661 is about 14704.5795927663. The cubic root of 216224661 is about 600.2079473659.

The spelling of 216224661 in words is "two hundred sixteen million, two hundred twenty-four thousand, six hundred sixty-one".