1606405243673 has 2 divisors, whose sum is σ = 1606405243674. Its totient is φ = 1606405243672.

The previous prime is 1606405243613. The next prime is 1606405243687. The reversal of 1606405243673 is 3763425046061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1595239728784 + 11165514889 = 1263028^2 + 105667^2 .

It is a cyclic number.

It is not a de Polignac number, because 1606405243673 - 2⁶ = 1606405243609 is a prime.

It is a super-3 number, since 3×1606405243673³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (1606405243603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 803202621836 + 803202621837.

It is an arithmetic number, because the mean of its divisors is an integer number (803202621837).

Almost surely, 2^{1606405243673} is an apocalyptic number.

It is an amenable number.

1606405243673 is a deficient number, since it is larger than the sum of its proper divisors (1).

1606405243673 is an equidigital number, since it uses as much as digits as its factorization.

1606405243673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2177280, while the sum is 47.

The spelling of 1606405243673 in words is "one trillion, six hundred six billion, four hundred five million, two hundred forty-three thousand, six hundred seventy-three".