216645003 has 8 divisors (see below), whose sum is σ = 320955600. Its totient is φ = 144429984.

The previous prime is 216644999. The next prime is 216645017. The reversal of 216645003 is 300546612.

216645003 is a `hidden beast` number, since 2 + 16 + 645 + 0 + 0 + 3 = 666.

It is not a de Polignac number, because 216645003 - 2² = 216644999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 8023889 = 216645003 / (2 + 1 + 6 + 6 + 4 + 5 + 0 + 0 + 3).

It is not an unprimeable number, because it can be changed into a prime (216645083) by changing a digit.

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, 4011918 + ... + 4011971.

It is an arithmetic number, because the mean of its divisors is an integer number (40119450).

Almost surely, 2^216645003 is an apocalyptic number.

216645003 is a deficient number, since it is larger than the sum of its proper divisors (104310597).

216645003 is an equidigital number, since it uses as much as digits as its factorization.

216645003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8023898 (or 8023892 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 216645003 is about 14718.8655473172. The cubic root of 216645003 is about 600.5966315214.

The spelling of 216645003 in words is "two hundred sixteen million, six hundred forty-five thousand, three".