666312301 has 2 divisors, whose sum is σ = 666312302. Its totient is φ = 666312300.

The previous prime is 666312281. The next prime is 666312347. The reversal of 666312301 is 103213666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 358344900 + 307967401 = 18930^2 + 17549^2 .

It is a cyclic number.

It is not a de Polignac number, because 666312301 - 2⁷ = 666312173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 666312301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666312401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333156150 + 333156151.

It is an arithmetic number, because the mean of its divisors is an integer number (333156151).

Almost surely, 2^666312301 is an apocalyptic number.

It is an amenable number.

666312301 is a deficient number, since it is larger than the sum of its proper divisors (1).

666312301 is an equidigital number, since it uses as much as digits as its factorization.

666312301 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 666312301 is about 25813.0258009401. The cubic root of 666312301 is about 873.4256538413.

Adding to 666312301 its reverse (103213666), we get a palindrome (769525967).

The spelling of 666312301 in words is "six hundred sixty-six million, three hundred twelve thousand, three hundred one".