1643324275609 has 4 divisors (see below), whose sum is σ = 1658400645220. Its totient is φ = 1628247906000.

The previous prime is 1643324275591. The next prime is 1643324275639. The reversal of 1643324275609 is 9065724233461.

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 474445440000 + 1168878835609 = 688800^2 + 1081147^2 .

It is a cyclic number.

It is not a de Polignac number, because 1643324275609 - 2⁵ = 1643324275577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1643324275639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7538184642 + ... + 7538184859.

It is an arithmetic number, because the mean of its divisors is an integer number (414600161305).

Almost surely, 2^{1643324275609} is an apocalyptic number.

It is an amenable number.

1643324275609 is a deficient number, since it is larger than the sum of its proper divisors (15076369611).

1643324275609 is a wasteful number, since it uses less digits than its factorization.

1643324275609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15076369610.

The product of its (nonzero) digits is 6531840, while the sum is 52.

The spelling of 1643324275609 in words is "one trillion, six hundred forty-three billion, three hundred twenty-four million, two hundred seventy-five thousand, six hundred nine".