216420065 has 8 divisors (see below), whose sum is σ = 261749760. Its totient is φ = 171772272.

The previous prime is 216420053. The next prime is 216420077. The reversal of 216420065 is 560024612.

It is an interprime number because it is at equal distance from previous prime (216420053) and next prime (216420077).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-216420065 is a prime.

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, 169775 + ... + 171044.

It is an arithmetic number, because the mean of its divisors is an integer number (32718720).

Almost surely, 2^216420065 is an apocalyptic number.

It is an amenable number.

216420065 is a deficient number, since it is larger than the sum of its proper divisors (45329695).

216420065 is a wasteful number, since it uses less digits than its factorization.

216420065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340951.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 216420065 is about 14711.2224169170. Note that the first 3 decimals coincide. The cubic root of 216420065 is about 600.3886972105.

Adding to 216420065 its reverse (560024612), we get a palindrome (776444677).

The spelling of 216420065 in words is "two hundred sixteen million, four hundred twenty thousand, sixty-five".