643323140226 has 96 divisors (see below), whose sum is σ = 1543871045808. Its totient is φ = 192319142400.

The previous prime is 643323140219. The next prime is 643323140267. The reversal of 643323140226 is 622041323346.

643323140226 is a `hidden beast` number, since 6 + 4 + 332 + 314 + 0 + 2 + 2 + 6 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 424453553001 + 218869587225 = 651501^2 + 467835^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6016260 + ... + 6122256.

Almost surely, 2^643323140226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643323140226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (771935522904).

643323140226 is an abundant number, since it is smaller than the sum of its proper divisors (900547905582).

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

643323140226 is a wasteful number, since it uses less digits than its factorization.

643323140226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106756 (or 106753 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 36.

The spelling of 643323140226 in words is "six hundred forty-three billion, three hundred twenty-three million, one hundred forty thousand, two hundred twenty-six".