3645326561 has 2 divisors, whose sum is σ = 3645326562. Its totient is φ = 3645326560.

The previous prime is 3645326521. The next prime is 3645326579. The reversal of 3645326561 is 1656235463.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2918700625 + 726625936 = 54025^2 + 26956^2 .

It is a cyclic number.

It is not a de Polignac number, because 3645326561 - 2⁶ = 3645326497 is a prime.

It is not a weakly prime, because it can be changed into another prime (3645326521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1822663280 + 1822663281.

It is an arithmetic number, because the mean of its divisors is an integer number (1822663281).

Almost surely, 2^3645326561 is an apocalyptic number.

It is an amenable number.

3645326561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3645326561 is an equidigital number, since it uses as much as digits as its factorization.

3645326561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 388800, while the sum is 41.

The square root of 3645326561 is about 60376.5398230140. The cubic root of 3645326561 is about 1539.0243104271.

The spelling of 3645326561 in words is "three billion, six hundred forty-five million, three hundred twenty-six thousand, five hundred sixty-one".