643441205346 has 16 divisors (see below), whose sum is σ = 1287021179808. Its totient is φ = 214457273600.

The previous prime is 643441205311. The next prime is 643441205369. The reversal of 643441205346 is 643502144346.

It is a super-2 number, since 2×643441205346² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 643441205298 and 643441205307.

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, 5721720 + ... + 5833091.

It is an arithmetic number, because the mean of its divisors is an integer number (80438823738).

Almost surely, 2^643441205346 is an apocalyptic number.

643441205346 is an abundant number, since it is smaller than the sum of its proper divisors (643579974462).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643441205346 is a wasteful number, since it uses less digits than its factorization.

643441205346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11564097.

The product of its (nonzero) digits is 829440, while the sum is 42.

The spelling of 643441205346 in words is "six hundred forty-three billion, four hundred forty-one million, two hundred five thousand, three hundred forty-six".