216620353 has 4 divisors (see below), whose sum is σ = 216749700. Its totient is φ = 216491008.

The previous prime is 216620351. The next prime is 216620377. The reversal of 216620353 is 353026612.

216620353 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 186677569 + 29942784 = 13663^2 + 5472^2 .

It is a cyclic number.

It is not a de Polignac number, because 216620353 - 2¹ = 216620351 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216620351) 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, 62128 + ... + 65521.

It is an arithmetic number, because the mean of its divisors is an integer number (54187425).

Almost surely, 2^216620353 is an apocalyptic number.

It is an amenable number.

216620353 is a deficient number, since it is larger than the sum of its proper divisors (129347).

216620353 is a wasteful number, since it uses less digits than its factorization.

216620353 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129346.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 216620353 is about 14718.0281627669. The cubic root of 216620353 is about 600.5738519076.

Adding to 216620353 its reverse (353026612), we get a palindrome (569646965).

The spelling of 216620353 in words is "two hundred sixteen million, six hundred twenty thousand, three hundred fifty-three".