665132647 has 2 divisors, whose sum is σ = 665132648. Its totient is φ = 665132646.

The previous prime is 665132623. The next prime is 665132687. The reversal of 665132647 is 746231566.

It is an a-pointer prime, because the next prime (665132687) can be obtained adding 665132647 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665132647 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665132687) 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, 332566323 + 332566324.

It is an arithmetic number, because the mean of its divisors is an integer number (332566324).

Almost surely, 2^665132647 is an apocalyptic number.

665132647 is a deficient number, since it is larger than the sum of its proper divisors (1).

665132647 is an equidigital number, since it uses as much as digits as its factorization.

665132647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 40.

The square root of 665132647 is about 25790.1657032288. The cubic root of 665132647 is about 872.9099053407.

The spelling of 665132647 in words is "six hundred sixty-five million, one hundred thirty-two thousand, six hundred forty-seven".