665875039 has 2 divisors, whose sum is σ = 665875040. Its totient is φ = 665875038.

The previous prime is 665875019. The next prime is 665875043. The reversal of 665875039 is 930578566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665875039 - 2¹³ = 665866847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665874983 and 665875001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665875019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332937519 + 332937520.

It is an arithmetic number, because the mean of its divisors is an integer number (332937520).

Almost surely, 2^665875039 is an apocalyptic number.

665875039 is a deficient number, since it is larger than the sum of its proper divisors (1).

665875039 is an equidigital number, since it uses as much as digits as its factorization.

665875039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1360800, while the sum is 49.

The square root of 665875039 is about 25804.5546173539. The cubic root of 665875039 is about 873.2345525508.

The spelling of 665875039 in words is "six hundred sixty-five million, eight hundred seventy-five thousand, thirty-nine".