545668709 has 2 divisors, whose sum is σ = 545668710. Its totient is φ = 545668708.

The previous prime is 545668691. The next prime is 545668741. The reversal of 545668709 is 907866545.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 461304484 + 84364225 = 21478^2 + 9185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-545668709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (545668769) 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, 272834354 + 272834355.

It is an arithmetic number, because the mean of its divisors is an integer number (272834355).

Almost surely, 2^545668709 is an apocalyptic number.

It is an amenable number.

545668709 is a deficient number, since it is larger than the sum of its proper divisors (1).

545668709 is an equidigital number, since it uses as much as digits as its factorization.

545668709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The square root of 545668709 is about 23359.5528424668. The cubic root of 545668709 is about 817.1648613331.

The spelling of 545668709 in words is "five hundred forty-five million, six hundred sixty-eight thousand, seven hundred nine".