1645403369 has 2 divisors, whose sum is σ = 1645403370. Its totient is φ = 1645403368.

The previous prime is 1645403339. The next prime is 1645403377. The reversal of 1645403369 is 9633045461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1126474969 + 518928400 = 33563^2 + 22780^2 .

It is a cyclic number.

It is not a de Polignac number, because 1645403369 - 2¹⁶ = 1645337833 is a prime.

It is a super-2 number, since 2×1645403369² = 5414704493433100322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1645403339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822701684 + 822701685.

It is an arithmetic number, because the mean of its divisors is an integer number (822701685).

Almost surely, 2^1645403369 is an apocalyptic number.

It is an amenable number.

1645403369 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645403369 is an equidigital number, since it uses as much as digits as its factorization.

1645403369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 41.

The square root of 1645403369 is about 40563.5719457742. The cubic root of 1645403369 is about 1180.5674205347.

The spelling of 1645403369 in words is "one billion, six hundred forty-five million, four hundred three thousand, three hundred sixty-nine".