643048309922 has 6 divisors (see below), whose sum is σ = 964574165979. Its totient is φ = 321523587930.

The previous prime is 643048309919. The next prime is 643048309931. The reversal of 643048309922 is 229903840346.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 321524154961 + 321524154961 = 567031^2 + 567031^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=567031.

It is a super-2 number, since 2×643048309922² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 850547 + ... + 1417577.

Almost surely, 2^643048309922 is an apocalyptic number.

643048309922 is a deficient number, since it is larger than the sum of its proper divisors (321525856057).

643048309922 is an frugal number, since it uses more digits than its factorization.

643048309922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1134064 (or 567033 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 50.

Multiplying 643048309922 by its sum of digits (50), we get a square (32152415496100 = 5670310²).

The spelling of 643048309922 in words is "six hundred forty-three billion, forty-eight million, three hundred nine thousand, nine hundred twenty-two".