1601778319073 has 2 divisors, whose sum is σ = 1601778319074. Its totient is φ = 1601778319072.

The previous prime is 1601778319021. The next prime is 1601778319081. The reversal of 1601778319073 is 3709138771061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1597349682769 + 4428636304 = 1263863^2 + 66548^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1601778319073 is a prime.

It is not a weakly prime, because it can be changed into another prime (1601778319573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800889159536 + 800889159537.

It is an arithmetic number, because the mean of its divisors is an integer number (800889159537).

Almost surely, 2^{1601778319073} is an apocalyptic number.

It is an amenable number.

1601778319073 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601778319073 is an equidigital number, since it uses as much as digits as its factorization.

1601778319073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1333584, while the sum is 53.

The spelling of 1601778319073 in words is "one trillion, six hundred one billion, seven hundred seventy-eight million, three hundred nineteen thousand, seventy-three".