666243137672153 has 2 divisors, whose sum is σ = 666243137672154. Its totient is φ = 666243137672152.

The previous prime is 666243137672107. The next prime is 666243137672237. The reversal of 666243137672153 is 351276731342666.

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., 420945770743369 + 245297366928784 = 20516963^2 + 15661972^2 .

It is a cyclic number.

It is not a de Polignac number, because 666243137672153 - 2¹⁶ = 666243137606617 is a prime.

It is not a weakly prime, because it can be changed into another prime (666243137642153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333121568836076 + 333121568836077.

It is an arithmetic number, because the mean of its divisors is an integer number (333121568836077).

Almost surely, 2^{666243137672153} is an apocalyptic number.

It is an amenable number.

666243137672153 is a deficient number, since it is larger than the sum of its proper divisors (1).

666243137672153 is an equidigital number, since it uses as much as digits as its factorization.

666243137672153 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 137168640, while the sum is 62.

The spelling of 666243137672153 in words is "six hundred sixty-six trillion, two hundred forty-three billion, one hundred thirty-seven million, six hundred seventy-two thousand, one hundred fifty-three".