643810069220 has 48 divisors (see below), whose sum is σ = 1416686906880. Its totient is φ = 245296630656.

The previous prime is 643810069207. The next prime is 643810069223. The reversal of 643810069220 is 22960018346.

It is a super-2 number, since 2×643810069220² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (643810069223) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2818067 + ... + 3037946.

It is an arithmetic number, because the mean of its divisors is an integer number (29514310560).

Almost surely, 2^643810069220 is an apocalyptic number.

It is an amenable number.

643810069220 is an abundant number, since it is smaller than the sum of its proper divisors (772876837660).

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

643810069220 is a wasteful number, since it uses less digits than its factorization.

643810069220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5856284 (or 5856282 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 41.

The spelling of 643810069220 in words is "six hundred forty-three billion, eight hundred ten million, sixty-nine thousand, two hundred twenty".