1605040389217 has 2 divisors, whose sum is σ = 1605040389218. Its totient is φ = 1605040389216.

The previous prime is 1605040389167. The next prime is 1605040389257. The reversal of 1605040389217 is 7129830405061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1364588440336 + 240451948881 = 1168156^2 + 490359^2 .

It is a cyclic number.

It is not a de Polignac number, because 1605040389217 - 2³¹ = 1602892905569 is a prime.

It is not a weakly prime, because it can be changed into another prime (1605040389257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802520194608 + 802520194609.

It is an arithmetic number, because the mean of its divisors is an integer number (802520194609).

It is a 1-persistent number, because it is pandigital, but 2⋅1605040389217 = 3210080778434 is not.

Almost surely, 2^{1605040389217} is an apocalyptic number.

It is an amenable number.

1605040389217 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605040389217 is an equidigital number, since it uses as much as digits as its factorization.

1605040389217 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 1605040389217 in words is "one trillion, six hundred five billion, forty million, three hundred eighty-nine thousand, two hundred seventeen".