666334139 has 2 divisors, whose sum is σ = 666334140. Its totient is φ = 666334138.

The previous prime is 666334133. The next prime is 666334153. The reversal of 666334139 is 931433666.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666334139 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 666334096 and 666334105.

It is not a weakly prime, because it can be changed into another prime (666334133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333167069 + 333167070.

It is an arithmetic number, because the mean of its divisors is an integer number (333167070).

Almost surely, 2^666334139 is an apocalyptic number.

666334139 is a deficient number, since it is larger than the sum of its proper divisors (1).

666334139 is an equidigital number, since it uses as much as digits as its factorization.

666334139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 41.

The square root of 666334139 is about 25813.4488009642. The cubic root of 666334139 is about 873.4351957438.

The spelling of 666334139 in words is "six hundred sixty-six million, three hundred thirty-four thousand, one hundred thirty-nine".