664180201 has 2 divisors, whose sum is σ = 664180202. Its totient is φ = 664180200.

The previous prime is 664180199. The next prime is 664180241. The reversal of 664180201 is 102081466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 553425625 + 110754576 = 23525^2 + 10524^2 .

It is a cyclic number.

It is not a de Polignac number, because 664180201 - 2¹ = 664180199 is a prime.

It is a super-2 number, since 2×664180201² = 882270678800800802, which contains 22 as substring.

Together with 664180199, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664180201.

It is not a weakly prime, because it can be changed into another prime (664180241) 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 as a sum of consecutive naturals, namely, 332090100 + 332090101.

It is an arithmetic number, because the mean of its divisors is an integer number (332090101).

Almost surely, 2^664180201 is an apocalyptic number.

It is an amenable number.

664180201 is a deficient number, since it is larger than the sum of its proper divisors (1).

664180201 is an equidigital number, since it uses as much as digits as its factorization.

664180201 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 664180201 is about 25771.6937937730. The cubic root of 664180201 is about 872.4930477849.

The spelling of 664180201 in words is "six hundred sixty-four million, one hundred eighty thousand, two hundred one".