665707543 has 2 divisors, whose sum is σ = 665707544. Its totient is φ = 665707542.

The previous prime is 665707517. The next prime is 665707571. The reversal of 665707543 is 345707566.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665707543 is a prime.

It is equal to p_34567288 and since 665707543 and 34567288 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 665707543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665707583) 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, 332853771 + 332853772.

It is an arithmetic number, because the mean of its divisors is an integer number (332853772).

Almost surely, 2^665707543 is an apocalyptic number.

665707543 is a deficient number, since it is larger than the sum of its proper divisors (1).

665707543 is an equidigital number, since it uses as much as digits as its factorization.

665707543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 529200, while the sum is 43.

The square root of 665707543 is about 25801.3089396643. The cubic root of 665707543 is about 873.1613278207.

The spelling of 665707543 in words is "six hundred sixty-five million, seven hundred seven thousand, five hundred forty-three".