665132687 has 2 divisors, whose sum is σ = 665132688. Its totient is φ = 665132686.

The previous prime is 665132647. The next prime is 665132717. The reversal of 665132687 is 786231566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665132687 - 2⁶ = 665132623 is a prime.

It is equal to p_34538939 and since 665132687 and 34538939 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 (665132647) 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, 332566343 + 332566344.

It is an arithmetic number, because the mean of its divisors is an integer number (332566344).

Almost surely, 2^665132687 is an apocalyptic number.

665132687 is a deficient number, since it is larger than the sum of its proper divisors (1).

665132687 is an equidigital number, since it uses as much as digits as its factorization.

665132687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 44.

The square root of 665132687 is about 25790.1664787182. The cubic root of 665132687 is about 872.9099228392.

The spelling of 665132687 in words is "six hundred sixty-five million, one hundred thirty-two thousand, six hundred eighty-seven".