216579673 has 2 divisors, whose sum is σ = 216579674. Its totient is φ = 216579672.

The previous prime is 216579667. The next prime is 216579679. The reversal of 216579673 is 376975612.

It is a balanced prime because it is at equal distance from previous prime (216579667) and next prime (216579679).

It can be written as a sum of positive squares in only one way, i.e., 184226329 + 32353344 = 13573^2 + 5688^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216579673 is a prime.

It is not a weakly prime, because it can be changed into another prime (216579679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108289836 + 108289837.

It is an arithmetic number, because the mean of its divisors is an integer number (108289837).

Almost surely, 2^216579673 is an apocalyptic number.

It is an amenable number.

216579673 is a deficient number, since it is larger than the sum of its proper divisors (1).

216579673 is an equidigital number, since it uses as much as digits as its factorization.

216579673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 476280, while the sum is 46.

The square root of 216579673 is about 14716.6461192760. The cubic root of 216579673 is about 600.5362548344.

The spelling of 216579673 in words is "two hundred sixteen million, five hundred seventy-nine thousand, six hundred seventy-three".