665053139 has 2 divisors, whose sum is σ = 665053140. Its totient is φ = 665053138.

The previous prime is 665053091. The next prime is 665053217. The reversal of 665053139 is 931350566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665053139 - 2¹² = 665049043 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (665053439) 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, 332526569 + 332526570.

It is an arithmetic number, because the mean of its divisors is an integer number (332526570).

Almost surely, 2^665053139 is an apocalyptic number.

665053139 is a deficient number, since it is larger than the sum of its proper divisors (1).

665053139 is an equidigital number, since it uses as much as digits as its factorization.

665053139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72900, while the sum is 38.

The square root of 665053139 is about 25788.6242168907. The cubic root of 665053139 is about 872.8751222606.

The spelling of 665053139 in words is "six hundred sixty-five million, fifty-three thousand, one hundred thirty-nine".