188665013 has 2 divisors, whose sum is σ = 188665014. Its totient is φ = 188665012.

The previous prime is 188665007. The next prime is 188665049. The reversal of 188665013 is 310566881.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103693489 + 84971524 = 10183^2 + 9218^2 .

It is a cyclic number.

It is not a de Polignac number, because 188665013 - 2¹⁰ = 188663989 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (188665073) 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, 94332506 + 94332507.

It is an arithmetic number, because the mean of its divisors is an integer number (94332507).

Almost surely, 2^188665013 is an apocalyptic number.

It is an amenable number.

188665013 is a deficient number, since it is larger than the sum of its proper divisors (1).

188665013 is an equidigital number, since it uses as much as digits as its factorization.

188665013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 188665013 is about 13735.5383221773. The cubic root of 188665013 is about 573.5401029566.

The spelling of 188665013 in words is "one hundred eighty-eight million, six hundred sixty-five thousand, thirteen".