1209663339161 has 2 divisors, whose sum is σ = 1209663339162. Its totient is φ = 1209663339160.

The previous prime is 1209663339113. The next prime is 1209663339191. The reversal of 1209663339161 is 1619333669021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 830276328025 + 379387011136 = 911195^2 + 615944^2 .

It is a cyclic number.

It is not a de Polignac number, because 1209663339161 - 2²² = 1209659144857 is a prime.

It is a super-2 number, since 2×1209663339161² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1209663339191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604831669580 + 604831669581.

It is an arithmetic number, because the mean of its divisors is an integer number (604831669581).

Almost surely, 2^{1209663339161} is an apocalyptic number.

It is an amenable number.

1209663339161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1209663339161 is an equidigital number, since it uses as much as digits as its factorization.

1209663339161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 944784, while the sum is 50.

The spelling of 1209663339161 in words is "one trillion, two hundred nine billion, six hundred sixty-three million, three hundred thirty-nine thousand, one hundred sixty-one".