1605805290079 has 2 divisors, whose sum is σ = 1605805290080. Its totient is φ = 1605805290078.

The previous prime is 1605805290073. The next prime is 1605805290127. The reversal of 1605805290079 is 9700925085061.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1605805290079 - 2¹⁹ = 1605804765791 is a prime.

It is a super-2 number, since 2×1605805290079² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1605805290073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802902645039 + 802902645040.

It is an arithmetic number, because the mean of its divisors is an integer number (802902645040).

Almost surely, 2^{1605805290079} is an apocalyptic number.

1605805290079 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605805290079 is an equidigital number, since it uses as much as digits as its factorization.

1605805290079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1360800, while the sum is 52.

The spelling of 1605805290079 in words is "one trillion, six hundred five billion, eight hundred five million, two hundred ninety thousand, seventy-nine".