1605288874349 has 2 divisors, whose sum is σ = 1605288874350. Its totient is φ = 1605288874348.

The previous prime is 1605288874309. The next prime is 1605288874429. The reversal of 1605288874349 is 9434788825061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1575921197449 + 29367676900 = 1255357^2 + 171370^2 .

It is a cyclic number.

It is not a de Polignac number, because 1605288874349 - 2¹² = 1605288870253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1605288874309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802644437174 + 802644437175.

It is an arithmetic number, because the mean of its divisors is an integer number (802644437175).

It is a 2-persistent number, because it is pandigital, and so is 2⋅1605288874349 = 3210577748698, but 3⋅1605288874349 = 4815866623047 is not.

Almost surely, 2^{1605288874349} is an apocalyptic number.

It is an amenable number.

1605288874349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605288874349 is an equidigital number, since it uses as much as digits as its factorization.

1605288874349 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 92897280, while the sum is 65.

The spelling of 1605288874349 in words is "one trillion, six hundred five billion, two hundred eighty-eight million, eight hundred seventy-four thousand, three hundred forty-nine".