1643413445 has 4 divisors (see below), whose sum is σ = 1972096140. Its totient is φ = 1314730752.

The previous prime is 1643413439. The next prime is 1643413487. The reversal of 1643413445 is 5443143461.

1643413445 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 626951521 + 1016461924 = 25039^2 + 31882^2 .

It is a cyclic number.

It is not a de Polignac number, because 1643413445 - 2⁶ = 1643413381 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164341340 + ... + 164341349.

It is an arithmetic number, because the mean of its divisors is an integer number (493024035).

Almost surely, 2^1643413445 is an apocalyptic number.

It is an amenable number.

1643413445 is a deficient number, since it is larger than the sum of its proper divisors (328682695).

1643413445 is an equidigital number, since it uses as much as digits as its factorization.

1643413445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328682694.

The product of its digits is 69120, while the sum is 35.

The square root of 1643413445 is about 40539.0360640211. The cubic root of 1643413445 is about 1180.0913088876.

The spelling of 1643413445 in words is "one billion, six hundred forty-three million, four hundred thirteen thousand, four hundred forty-five".