1645068361 has 2 divisors, whose sum is σ = 1645068362. Its totient is φ = 1645068360.

The previous prime is 1645068343. The next prime is 1645068389. The reversal of 1645068361 is 1638605461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1112889600 + 532178761 = 33360^2 + 23069^2 .

It is a cyclic number.

It is not a de Polignac number, because 1645068361 - 2⁷ = 1645068233 is a prime.

It is not a weakly prime, because it can be changed into another prime (1645068301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822534180 + 822534181.

It is an arithmetic number, because the mean of its divisors is an integer number (822534181).

Almost surely, 2^1645068361 is an apocalyptic number.

It is an amenable number.

1645068361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645068361 is an equidigital number, since it uses as much as digits as its factorization.

1645068361 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 1645068361 is about 40559.4423161858. The cubic root of 1645068361 is about 1180.4872929942.

The spelling of 1645068361 in words is "one billion, six hundred forty-five million, sixty-eight thousand, three hundred sixty-one".