216606613 has 4 divisors (see below), whose sum is σ = 217312480. Its totient is φ = 215900748.

The previous prime is 216606581. The next prime is 216606629. The reversal of 216606613 is 316606612.

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 216606613 - 2⁵ = 216606581 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 (216606683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 352473 + ... + 353086.

It is an arithmetic number, because the mean of its divisors is an integer number (54328120).

Almost surely, 2^216606613 is an apocalyptic number.

It is an amenable number.

216606613 is a deficient number, since it is larger than the sum of its proper divisors (705867).

216606613 is an equidigital number, since it uses as much as digits as its factorization.

216606613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705866.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 216606613 is about 14717.5613808810. The cubic root of 216606613 is about 600.5611537176.

Subtracting 216606613 from its reverse (316606612), we obtain a palindrome (99999999).

The spelling of 216606613 in words is "two hundred sixteen million, six hundred six thousand, six hundred thirteen".