666737201 has 4 divisors (see below), whose sum is σ = 718024692. Its totient is φ = 615449712.

The previous prime is 666737153. The next prime is 666737209. The reversal of 666737201 is 102737666.

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 153760000 + 512977201 = 12400^2 + 22649^2 .

It is a cyclic number.

It is not a de Polignac number, because 666737201 - 2¹⁰ = 666736177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (666737209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25643726 + ... + 25643751.

It is an arithmetic number, because the mean of its divisors is an integer number (179506173).

Almost surely, 2^666737201 is an apocalyptic number.

It is an amenable number.

666737201 is a deficient number, since it is larger than the sum of its proper divisors (51287491).

666737201 is a wasteful number, since it uses less digits than its factorization.

666737201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51287490.

The product of its (nonzero) digits is 63504, while the sum is 38.

The square root of 666737201 is about 25821.2548300814. The cubic root of 666737201 is about 873.6112723577.

The spelling of 666737201 in words is "six hundred sixty-six million, seven hundred thirty-seven thousand, two hundred one".