1797323978309 has 2 divisors, whose sum is σ = 1797323978310. Its totient is φ = 1797323978308.

The previous prime is 1797323978299. The next prime is 1797323978327. The reversal of 1797323978309 is 9038793237971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1213203117025 + 584120861284 = 1101455^2 + 764278^2 .

It is a cyclic number.

It is not a de Polignac number, because 1797323978309 - 2¹⁶ = 1797323912773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1797323978369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 898661989154 + 898661989155.

It is an arithmetic number, because the mean of its divisors is an integer number (898661989155).

Almost surely, 2^{1797323978309} is an apocalyptic number.

It is an amenable number.

1797323978309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1797323978309 is an equidigital number, since it uses as much as digits as its factorization.

1797323978309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108020304, while the sum is 68.

The spelling of 1797323978309 in words is "one trillion, seven hundred ninety-seven billion, three hundred twenty-three million, nine hundred seventy-eight thousand, three hundred nine".