1643320564345 has 8 divisors (see below), whose sum is σ = 1977133464576. Its totient is φ = 1311223926576.

The previous prime is 1643320564289. The next prime is 1643320564387. The reversal of 1643320564345 is 5434650233461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1643320564345 - 2²⁷ = 1643186346617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1643320564295 and 1643320564304.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 429063507 + ... + 429067336.

It is an arithmetic number, because the mean of its divisors is an integer number (247141683072).

Almost surely, 2^{1643320564345} is an apocalyptic number.

It is an amenable number.

1643320564345 is a deficient number, since it is larger than the sum of its proper divisors (333812900231).

1643320564345 is an equidigital number, since it uses as much as digits as its factorization.

1643320564345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858131231.

The product of its (nonzero) digits is 3110400, while the sum is 46.

The spelling of 1643320564345 in words is "one trillion, six hundred forty-three billion, three hundred twenty million, five hundred sixty-four thousand, three hundred forty-five".