216065747 has 4 divisors (see below), whose sum is σ = 223516320. Its totient is φ = 208615176.

The previous prime is 216065741. The next prime is 216065761. The reversal of 216065747 is 747560612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 216065747 - 2⁸ = 216065491 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216065747.

It is not an unprimeable number, because it can be changed into a prime (216065741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3725243 + ... + 3725300.

It is an arithmetic number, because the mean of its divisors is an integer number (55879080).

Almost surely, 2^216065747 is an apocalyptic number.

216065747 is a deficient number, since it is larger than the sum of its proper divisors (7450573).

216065747 is an equidigital number, since it uses as much as digits as its factorization.

216065747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7450572.

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 216065747 is about 14699.1750448792. The cubic root of 216065747 is about 600.0608706762.

The spelling of 216065747 in words is "two hundred sixteen million, sixty-five thousand, seven hundred forty-seven".