1605544673 has 2 divisors, whose sum is σ = 1605544674. Its totient is φ = 1605544672.

The previous prime is 1605544657. The next prime is 1605544691. The reversal of 1605544673 is 3764455061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1118768704 + 486775969 = 33448^2 + 22063^2 .

It is a cyclic number.

It is not a de Polignac number, because 1605544673 - 2⁴ = 1605544657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1605544673.

It is not a weakly prime, because it can be changed into another prime (1605544273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 802772336 + 802772337.

It is an arithmetic number, because the mean of its divisors is an integer number (802772337).

Almost surely, 2^1605544673 is an apocalyptic number.

It is an amenable number.

1605544673 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605544673 is an equidigital number, since it uses as much as digits as its factorization.

1605544673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 41.

The square root of 1605544673 is about 40069.2484706165. The cubic root of 1605544673 is about 1170.9565978026.

The spelling of 1605544673 in words is "one billion, six hundred five million, five hundred forty-four thousand, six hundred seventy-three".