1805474473609 has 2 divisors, whose sum is σ = 1805474473610. Its totient is φ = 1805474473608.

The previous prime is 1805474473513. The next prime is 1805474473679. The reversal of 1805474473609 is 9063744745081.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1649097725584 + 156376748025 = 1284172^2 + 395445^2 .

It is a cyclic number.

It is not a de Polignac number, because 1805474473609 - 2²⁷ = 1805340255881 is a prime.

It is not a weakly prime, because it can be changed into another prime (1805474473679) 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, 902737236804 + 902737236805.

It is an arithmetic number, because the mean of its divisors is an integer number (902737236805).

Almost surely, 2^{1805474473609} is an apocalyptic number.

It is an amenable number.

1805474473609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1805474473609 is an equidigital number, since it uses as much as digits as its factorization.

1805474473609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20321280, while the sum is 58.

The spelling of 1805474473609 in words is "one trillion, eight hundred five billion, four hundred seventy-four million, four hundred seventy-three thousand, six hundred nine".