666412001 has 2 divisors, whose sum is σ = 666412002. Its totient is φ = 666412000.

The previous prime is 666411973. The next prime is 666412049. The reversal of 666412001 is 100214666.

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., 603193600 + 63218401 = 24560^2 + 7951^2 .

It is a cyclic number.

It is not a de Polignac number, because 666412001 - 2¹⁰ = 666410977 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (666412501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333206000 + 333206001.

It is an arithmetic number, because the mean of its divisors is an integer number (333206001).

Almost surely, 2^666412001 is an apocalyptic number.

It is an amenable number.

666412001 is a deficient number, since it is larger than the sum of its proper divisors (1).

666412001 is an equidigital number, since it uses as much as digits as its factorization.

666412001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 666412001 is about 25814.9569242329. The cubic root of 666412001 is about 873.4692150936.

Adding to 666412001 its reverse (100214666), we get a palindrome (766626667).

The spelling of 666412001 in words is "six hundred sixty-six million, four hundred twelve thousand, one".