666316201 has 4 divisors (see below), whose sum is σ = 687810304. Its totient is φ = 644822100.

The previous prime is 666316171. The next prime is 666316243. The reversal of 666316201 is 102613666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 666316201 - 2⁵ = 666316169 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 21494071 = 666316201 / (6 + 6 + 6 + 3 + 1 + 6 + 2 + 0 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666316271) 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, 10747005 + ... + 10747066.

It is an arithmetic number, because the mean of its divisors is an integer number (171952576).

Almost surely, 2^666316201 is an apocalyptic number.

It is an amenable number.

666316201 is a deficient number, since it is larger than the sum of its proper divisors (21494103).

666316201 is a wasteful number, since it uses less digits than its factorization.

666316201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21494102.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 666316201 is about 25813.1013440849. The cubic root of 666316201 is about 873.4273579238.

Adding to 666316201 its reverse (102613666), we get a palindrome (768929867).

The spelling of 666316201 in words is "six hundred sixty-six million, three hundred sixteen thousand, two hundred one".