216223745 has 16 divisors (see below), whose sum is σ = 267457680. Its totient is φ = 167687424.

The previous prime is 216223717. The next prime is 216223747. The reversal of 216223745 is 547322612.

It can be written as a sum of positive squares in 8 ways, for example, as 35617024 + 180606721 = 5968^2 + 13439^2 .

It is a cyclic number.

It is not a de Polignac number, because 216223745 - 2⁸ = 216223489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216223747) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52211 + ... + 56199.

It is an arithmetic number, because the mean of its divisors is an integer number (16716105).

Almost surely, 2^216223745 is an apocalyptic number.

It is an amenable number.

216223745 is a deficient number, since it is larger than the sum of its proper divisors (51233935).

216223745 is a wasteful number, since it uses less digits than its factorization.

216223745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4324.

The product of its digits is 20160, while the sum is 32.

The square root of 216223745 is about 14704.5484459741. The cubic root of 216223745 is about 600.2070998042.

The spelling of 216223745 in words is "two hundred sixteen million, two hundred twenty-three thousand, seven hundred forty-five".