216562673 has 4 divisors (see below), whose sum is σ = 217259328. Its totient is φ = 215866020.

The previous prime is 216562669. The next prime is 216562727. The reversal of 216562673 is 376265612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216562673 - 2² = 216562669 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216552673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347861 + ... + 348482.

It is an arithmetic number, because the mean of its divisors is an integer number (54314832).

Almost surely, 2^216562673 is an apocalyptic number.

It is an amenable number.

216562673 is a deficient number, since it is larger than the sum of its proper divisors (696655).

216562673 is an equidigital number, since it uses as much as digits as its factorization.

216562673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696654.

The product of its digits is 90720, while the sum is 38.

The square root of 216562673 is about 14716.0685306912. The cubic root of 216562673 is about 600.5205417817.

The spelling of 216562673 in words is "two hundred sixteen million, five hundred sixty-two thousand, six hundred seventy-three".