216905005 has 8 divisors (see below), whose sum is σ = 260381952. Its totient is φ = 173460048.

The previous prime is 216904999. The next prime is 216905011. The reversal of 216905005 is 500509612.

It is an interprime number because it is at equal distance from previous prime (216904999) and next prime (216905011).

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-216905005 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11052 + ... + 23578.

It is an arithmetic number, because the mean of its divisors is an integer number (32547744).

Almost surely, 2^216905005 is an apocalyptic number.

It is an amenable number.

216905005 is a deficient number, since it is larger than the sum of its proper divisors (43476947).

216905005 is a wasteful number, since it uses less digits than its factorization.

216905005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15995.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 216905005 is about 14727.6951693060. The cubic root of 216905005 is about 600.8367999930.

The spelling of 216905005 in words is "two hundred sixteen million, nine hundred five thousand, five".