666010201 has 4 divisors (see below), whose sum is σ = 688976100. Its totient is φ = 643044304.

The previous prime is 666010199. The next prime is 666010223. The reversal of 666010201 is 102010666.

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

It can be written as a sum of positive squares in 2 ways, for example, as 431185225 + 234824976 = 20765^2 + 15324^2 .

It is a cyclic number.

It is not a de Polignac number, because 666010201 - 2¹ = 666010199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666010271) 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, 11482906 + ... + 11482963.

It is an arithmetic number, because the mean of its divisors is an integer number (172244025).

Almost surely, 2^666010201 is an apocalyptic number.

It is an amenable number.

666010201 is a deficient number, since it is larger than the sum of its proper divisors (22965899).

666010201 is a wasteful number, since it uses less digits than its factorization.

666010201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22965898.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 666010201 is about 25807.1734407316. The cubic root of 666010201 is about 873.2936327769.

Adding to 666010201 its reverse (102010666), we get a palindrome (768020867).

It can be divided in two parts, 6660 and 10201, that added together give a palindrome (16861).

The spelling of 666010201 in words is "six hundred sixty-six million, ten thousand, two hundred one".