6668216201 has 4 divisors (see below), whose sum is σ = 6669058452. Its totient is φ = 6667373952.

The previous prime is 6668216141. The next prime is 6668216213. The reversal of 6668216201 is 1026128666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1026128666 = 2 ⋅513064333.

It can be written as a sum of positive squares in 2 ways, for example, as 1279922176 + 5388294025 = 35776^2 + 73405^2 .

It is a cyclic number.

It is not a de Polignac number, because 6668216201 - 2¹⁴ = 6668199817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6668216251) 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, 409136 + ... + 425121.

It is an arithmetic number, because the mean of its divisors is an integer number (1667264613).

Almost surely, 2^6668216201 is an apocalyptic number.

It is an amenable number.

6668216201 is a deficient number, since it is larger than the sum of its proper divisors (842251).

6668216201 is an equidigital number, since it uses as much as digits as its factorization.

6668216201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842250.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 6668216201 is about 81659.1464625978. The cubic root of 6668216201 is about 1882.2178632297.

The spelling of 6668216201 in words is "six billion, six hundred sixty-eight million, two hundred sixteen thousand, two hundred one".