665860133 has 2 divisors, whose sum is σ = 665860134. Its totient is φ = 665860132.

The previous prime is 665860127. The next prime is 665860159. The reversal of 665860133 is 331068566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 433389124 + 232471009 = 20818^2 + 15247^2 .

It is a cyclic number.

It is not a de Polignac number, because 665860133 - 2¹⁰ = 665859109 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_34574735 and since 665860133 and 34574735 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665860163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332930066 + 332930067.

It is an arithmetic number, because the mean of its divisors is an integer number (332930067).

Almost surely, 2^665860133 is an apocalyptic number.

It is an amenable number.

665860133 is a deficient number, since it is larger than the sum of its proper divisors (1).

665860133 is an equidigital number, since it uses as much as digits as its factorization.

665860133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 38.

The square root of 665860133 is about 25804.2657907564. The cubic root of 665860133 is about 873.2280365478.

The spelling of 665860133 in words is "six hundred sixty-five million, eight hundred sixty thousand, one hundred thirty-three".