1205643320351 has 2 divisors, whose sum is σ = 1205643320352. Its totient is φ = 1205643320350.

The previous prime is 1205643320309. The next prime is 1205643320383. The reversal of 1205643320351 is 1530233465021.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1205643320351 - 2³⁴ = 1188463451167 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1205643320251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602821660175 + 602821660176.

It is an arithmetic number, because the mean of its divisors is an integer number (602821660176).

Almost surely, 2^{1205643320351} is an apocalyptic number.

1205643320351 is a deficient number, since it is larger than the sum of its proper divisors (1).

1205643320351 is an equidigital number, since it uses as much as digits as its factorization.

1205643320351 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 35.

Adding to 1205643320351 its reverse (1530233465021), we get a palindrome (2735876785372).

The spelling of 1205643320351 in words is "one trillion, two hundred five billion, six hundred forty-three million, three hundred twenty thousand, three hundred fifty-one".