405666673 has 2 divisors, whose sum is σ = 405666674. Its totient is φ = 405666672.

The previous prime is 405666661. The next prime is 405666683. The reversal of 405666673 is 376666504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 354644224 + 51022449 = 18832^2 + 7143^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-405666673 is a prime.

It is not a weakly prime, because it can be changed into another prime (405666623) 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, 202833336 + 202833337.

It is an arithmetic number, because the mean of its divisors is an integer number (202833337).

Almost surely, 2^405666673 is an apocalyptic number.

It is an amenable number.

405666673 is a deficient number, since it is larger than the sum of its proper divisors (1).

405666673 is an equidigital number, since it uses as much as digits as its factorization.

405666673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 43.

The square root of 405666673 is about 20141.1686105846. The cubic root of 405666673 is about 740.2693644409.

The spelling of 405666673 in words is "four hundred five million, six hundred sixty-six thousand, six hundred seventy-three".