5645818649 has 2 divisors, whose sum is σ = 5645818650. Its totient is φ = 5645818648.

The previous prime is 5645818621. The next prime is 5645818691. The reversal of 5645818649 is 9468185465.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4484713024 + 1161105625 = 66968^2 + 34075^2 .

It is a cyclic number.

It is not a de Polignac number, because 5645818649 - 2⁸ = 5645818393 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 5645818594 and 5645818603.

It is not a weakly prime, because it can be changed into another prime (5645818699) 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, 2822909324 + 2822909325.

It is an arithmetic number, because the mean of its divisors is an integer number (2822909325).

Almost surely, 2^5645818649 is an apocalyptic number.

It is an amenable number.

5645818649 is a deficient number, since it is larger than the sum of its proper divisors (1).

5645818649 is an equidigital number, since it uses as much as digits as its factorization.

5645818649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8294400, while the sum is 56.

The square root of 5645818649 is about 75138.6628108326. The cubic root of 5645818649 is about 1780.6380165607.

The spelling of 5645818649 in words is "five billion, six hundred forty-five million, eight hundred eighteen thousand, six hundred forty-nine".