665970259 has 2 divisors, whose sum is σ = 665970260. Its totient is φ = 665970258.

The previous prime is 665970211. The next prime is 665970269. The reversal of 665970259 is 952079566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665970259 - 2¹¹ = 665968211 is a prime.

It is not a weakly prime, because it can be changed into another prime (665970209) 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, 332985129 + 332985130.

It is an arithmetic number, because the mean of its divisors is an integer number (332985130).

Almost surely, 2^665970259 is an apocalyptic number.

665970259 is a deficient number, since it is larger than the sum of its proper divisors (1).

665970259 is an equidigital number, since it uses as much as digits as its factorization.

665970259 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1020600, while the sum is 49.

The square root of 665970259 is about 25806.3995745241. The cubic root of 665970259 is about 873.2761746902.

The spelling of 665970259 in words is "six hundred sixty-five million, nine hundred seventy thousand, two hundred fifty-nine".