3666544213201 has 2 divisors, whose sum is σ = 3666544213202. Its totient is φ = 3666544213200.

The previous prime is 3666544213187. The next prime is 3666544213219. The reversal of 3666544213201 is 1023124456663.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2750074972225 + 916469240976 = 1658335^2 + 957324^2 .

It is a cyclic number.

It is not a de Polignac number, because 3666544213201 - 2¹⁷ = 3666544082129 is a prime.

It is not a weakly prime, because it can be changed into another prime (3666544213271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1833272106600 + 1833272106601.

It is an arithmetic number, because the mean of its divisors is an integer number (1833272106601).

Almost surely, 2^{3666544213201} is an apocalyptic number.

It is an amenable number.

3666544213201 is a deficient number, since it is larger than the sum of its proper divisors (1).

3666544213201 is an equidigital number, since it uses as much as digits as its factorization.

3666544213201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 43.

Adding to 3666544213201 its reverse (1023124456663), we get a palindrome (4689668669864).

The spelling of 3666544213201 in words is "three trillion, six hundred sixty-six billion, five hundred forty-four million, two hundred thirteen thousand, two hundred one".