643071406668 has 48 divisors (see below), whose sum is σ = 1643549654880. Its totient is φ = 194791066624.

The previous prime is 643071406657. The next prime is 643071406673. The reversal of 643071406668 is 866604170346.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 643071406668.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 54344271 + ... + 54356102.

It is an arithmetic number, because the mean of its divisors is an integer number (34240617810).

Almost surely, 2^643071406668 is an apocalyptic number.

643071406668 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

643071406668 is an abundant number, since it is smaller than the sum of its proper divisors (1000478248212).

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

643071406668 is a wasteful number, since it uses less digits than its factorization.

643071406668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108700426 (or 108700424 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 51.

The spelling of 643071406668 in words is "six hundred forty-three billion, seventy-one million, four hundred six thousand, six hundred sixty-eight".