1645240033 has 2 divisors, whose sum is σ = 1645240034. Its totient is φ = 1645240032.

The previous prime is 1645240031. The next prime is 1645240073. The reversal of 1645240033 is 3300425461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1465894369 + 179345664 = 38287^2 + 13392^2 .

It is an emirp because it is prime and its reverse (3300425461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1645240033 - 2¹ = 1645240031 is a prime.

Together with 1645240031, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1645239983 and 1645240010.

It is not a weakly prime, because it can be changed into another prime (1645240031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822620016 + 822620017.

It is an arithmetic number, because the mean of its divisors is an integer number (822620017).

Almost surely, 2^1645240033 is an apocalyptic number.

It is an amenable number.

1645240033 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645240033 is an equidigital number, since it uses as much as digits as its factorization.

1645240033 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 1645240033 is about 40561.5585622643. The cubic root of 1645240033 is about 1180.5283550296.

Adding to 1645240033 its reverse (3300425461), we get a palindrome (4945665494).

The spelling of 1645240033 in words is "one billion, six hundred forty-five million, two hundred forty thousand, thirty-three".