216415345 has 8 divisors (see below), whose sum is σ = 265738176. Its totient is φ = 169105776.

The previous prime is 216415319. The next prime is 216415351. The reversal of 216415345 is 543514612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216415345 - 2⁹ = 216414833 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 503077 + ... + 503506.

It is an arithmetic number, because the mean of its divisors is an integer number (33217272).

Almost surely, 2^216415345 is an apocalyptic number.

It is an amenable number.

216415345 is a deficient number, since it is larger than the sum of its proper divisors (49322831).

216415345 is a wasteful number, since it uses less digits than its factorization.

216415345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006631.

The product of its digits is 14400, while the sum is 31.

The square root of 216415345 is about 14711.0619942953. The cubic root of 216415345 is about 600.3843324654.

Adding to 216415345 its reverse (543514612), we get a palindrome (759929957).

The spelling of 216415345 in words is "two hundred sixteen million, four hundred fifteen thousand, three hundred forty-five".