643222967328 has 378 divisors, whose sum is σ = 1953319878909. Its totient is φ = 208405384704.

The previous prime is 643222967311. The next prime is 643222967371. The reversal of 643222967328 is 823769222346.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

643222967328 is a `hidden beast` number, since 6 + 4 + 3 + 22 + 296 + 7 + 328 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 574970359824 + 68252607504 = 758268^2 + 261252^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=567108.

It is a Harshad number since it is a multiple of its sum of digits (54).

Its product of digits (10450944) is a multiple of the sum of its prime factors (324).

It is an unprimeable number.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 7227224308 + ... + 7227224396.

Almost surely, 2^643222967328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643222967328

643222967328 is an abundant number, since it is smaller than the sum of its proper divisors (1310096911581).

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

643222967328 is an frugal number, since it uses more digits than its factorization.

643222967328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324 (or 153 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 54.

The spelling of 643222967328 in words is "six hundred forty-three billion, two hundred twenty-two million, nine hundred sixty-seven thousand, three hundred twenty-eight".