643011326352 has 60 divisors (see below), whose sum is σ = 1848174837340. Its totient is φ = 208544212224.

The previous prime is 643011326351. The next prime is 643011326371. The reversal of 643011326352 is 253623110346.

643011326352 is a `hidden beast` number, since 6 + 4 + 3 + 0 + 1 + 13 + 2 + 635 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 527128273296 + 115883053056 = 726036^2 + 340416^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (643011326351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60337327 + ... + 60347982.

Almost surely, 2^643011326352 is an apocalyptic number.

It is an amenable number.

643011326352 is an abundant number, since it is smaller than the sum of its proper divisors (1205163510988).

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

643011326352 is a wasteful number, since it uses less digits than its factorization.

643011326352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120685360 (or 120685351 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

Adding to 643011326352 its reverse (253623110346), we get a palindrome (896634436698).

The spelling of 643011326352 in words is "six hundred forty-three billion, eleven million, three hundred twenty-six thousand, three hundred fifty-two".