643017645420 has 24 divisors (see below), whose sum is σ = 1800449407344. Its totient is φ = 171471372096.

The previous prime is 643017645407. The next prime is 643017645469. The reversal of 643017645420 is 24546710346.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5358480319 + ... + 5358480438.

It is an arithmetic number, because the mean of its divisors is an integer number (75018725306).

Almost surely, 2^643017645420 is an apocalyptic number.

643017645420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

643017645420 is an abundant number, since it is smaller than the sum of its proper divisors (1157431761924).

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

643017645420 is a wasteful number, since it uses less digits than its factorization.

643017645420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10716960769 (or 10716960767 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 42.

The spelling of 643017645420 in words is "six hundred forty-three billion, seventeen million, six hundred forty-five thousand, four hundred twenty".