1605381954089 has 2 divisors, whose sum is σ = 1605381954090. Its totient is φ = 1605381954088.

The previous prime is 1605381954053. The next prime is 1605381954103. The reversal of 1605381954089 is 9804591835061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1246143550864 + 359238403225 = 1116308^2 + 599365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1605381954089 is a prime.

It is a super-2 number, since 2×1605381954089² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1605381954889) 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, 802690977044 + 802690977045.

It is an arithmetic number, because the mean of its divisors is an integer number (802690977045).

Almost surely, 2^{1605381954089} is an apocalyptic number.

It is an amenable number.

1605381954089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1605381954089 is an equidigital number, since it uses as much as digits as its factorization.

1605381954089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9331200, while the sum is 59.

The spelling of 1605381954089 in words is "one trillion, six hundred five billion, three hundred eighty-one million, nine hundred fifty-four thousand, eighty-nine".