666412049 has 2 divisors, whose sum is σ = 666412050. Its totient is φ = 666412048.

The previous prime is 666412001. The next prime is 666412127. The reversal of 666412049 is 940214666.

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., 664608400 + 1803649 = 25780^2 + 1343^2 .

It is a cyclic number.

It is not a de Polignac number, because 666412049 - 2¹² = 666407953 is a prime.

It is not a weakly prime, because it can be changed into another prime (666412249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333206024 + 333206025.

It is an arithmetic number, because the mean of its divisors is an integer number (333206025).

Almost surely, 2^666412049 is an apocalyptic number.

It is an amenable number.

666412049 is a deficient number, since it is larger than the sum of its proper divisors (1).

666412049 is an equidigital number, since it uses as much as digits as its factorization.

666412049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 666412049 is about 25814.9578539265. The cubic root of 666412049 is about 873.4692360649.

The spelling of 666412049 in words is "six hundred sixty-six million, four hundred twelve thousand, forty-nine".