666074729 has 2 divisors, whose sum is σ = 666074730. Its totient is φ = 666074728.

The previous prime is 666074723. The next prime is 666074749. The reversal of 666074729 is 927470666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 662959504 + 3115225 = 25748^2 + 1765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666074729 is a prime.

It is a super-2 number, since 2×666074729² = 887311089224846882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (666074723) 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, 333037364 + 333037365.

It is an arithmetic number, because the mean of its divisors is an integer number (333037365).

Almost surely, 2^666074729 is an apocalyptic number.

It is an amenable number.

666074729 is a deficient number, since it is larger than the sum of its proper divisors (1).

666074729 is an equidigital number, since it uses as much as digits as its factorization.

666074729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 762048, while the sum is 47.

The square root of 666074729 is about 25808.4236054820. The cubic root of 666074729 is about 873.3218355840.

The spelling of 666074729 in words is "six hundred sixty-six million, seventy-four thousand, seven hundred twenty-nine".