666674039 has 2 divisors, whose sum is σ = 666674040. Its totient is φ = 666674038.

The previous prime is 666674027. The next prime is 666674059. The reversal of 666674039 is 930476666.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666674039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 666673984 and 666674002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666674059) 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, 333337019 + 333337020.

It is an arithmetic number, because the mean of its divisors is an integer number (333337020).

Almost surely, 2^666674039 is an apocalyptic number.

666674039 is a deficient number, since it is larger than the sum of its proper divisors (1).

666674039 is an equidigital number, since it uses as much as digits as its factorization.

666674039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 979776, while the sum is 47.

The square root of 666674039 is about 25820.0317389425. The cubic root of 666674039 is about 873.5836848876.

The spelling of 666674039 in words is "six hundred sixty-six million, six hundred seventy-four thousand, thirty-nine".