216568465 has 4 divisors (see below), whose sum is σ = 259882164. Its totient is φ = 173254768.

The previous prime is 216568427. The next prime is 216568481. The reversal of 216568465 is 564865612.

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 51394561 + 165173904 = 7169^2 + 12852^2 .

It is a cyclic number.

It is not a de Polignac number, because 216568465 - 2⁷ = 216568337 is a prime.

It is a Duffinian 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, 21656842 + ... + 21656851.

It is an arithmetic number, because the mean of its divisors is an integer number (64970541).

Almost surely, 2^216568465 is an apocalyptic number.

It is an amenable number.

216568465 is a deficient number, since it is larger than the sum of its proper divisors (43313699).

216568465 is an equidigital number, since it uses as much as digits as its factorization.

216568465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43313698.

The product of its digits is 345600, while the sum is 43.

The square root of 216568465 is about 14716.2653210657. The cubic root of 216568465 is about 600.5258954035.

The spelling of 216568465 in words is "two hundred sixteen million, five hundred sixty-eight thousand, four hundred sixty-five".