643862610336408 has 64 divisors (see below), whose sum is σ = 1622258176665600. Its totient is φ = 212945703304320.

The previous prime is 643862610336389. The next prime is 643862610336431. The reversal of 643862610336408 is 804633016268346.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 155876728 + ... + 159953991.

It is an arithmetic number, because the mean of its divisors is an integer number (25347784010400).

Almost surely, 2^{643862610336408} is an apocalyptic number.

It is an amenable number.

643862610336408 is an abundant number, since it is smaller than the sum of its proper divisors (978395566329192).

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

643862610336408 is a wasteful number, since it uses less digits than its factorization.

643862610336408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315831392 (or 315831388 counting only the distinct ones).

The product of its (nonzero) digits is 71663616, while the sum is 60.

The spelling of 643862610336408 in words is "six hundred forty-three trillion, eight hundred sixty-two billion, six hundred ten million, three hundred thirty-six thousand, four hundred eight".