216352445 has 4 divisors (see below), whose sum is σ = 259622940. Its totient is φ = 173081952.

The previous prime is 216352349. The next prime is 216352453. The reversal of 216352445 is 544253612.

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 63904036 + 152448409 = 7994^2 + 12347^2 .

It is a cyclic number.

It is not a de Polignac number, because 216352445 - 2⁸ = 216352189 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21635240 + ... + 21635249.

It is an arithmetic number, because the mean of its divisors is an integer number (64905735).

Almost surely, 2^216352445 is an apocalyptic number.

It is an amenable number.

216352445 is a deficient number, since it is larger than the sum of its proper divisors (43270495).

216352445 is an equidigital number, since it uses as much as digits as its factorization.

216352445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43270494.

The product of its digits is 28800, while the sum is 32.

The square root of 216352445 is about 14708.9239919173. The cubic root of 216352445 is about 600.3261606296.

The spelling of 216352445 in words is "two hundred sixteen million, three hundred fifty-two thousand, four hundred forty-five".