643751998573696 has 256 divisors, whose sum is σ = 1347192069984000. Its totient is φ = 306199828480000.

The previous prime is 643751998573657. The next prime is 643751998573729. The reversal of 643751998573696 is 696375899157346.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7248517131 + ... + 7248605941.

It is an arithmetic number, because the mean of its divisors is an integer number (5262469023375).

Almost surely, 2^{643751998573696} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643751998573696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (673596034992000).

643751998573696 is an abundant number, since it is smaller than the sum of its proper divisors (703440071410304).

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

643751998573696 is a wasteful number, since it uses less digits than its factorization.

643751998573696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89199 (or 89187 counting only the distinct ones).

The product of its digits is 55553299200, while the sum is 88.

The spelling of 643751998573696 in words is "six hundred forty-three trillion, seven hundred fifty-one billion, nine hundred ninety-eight million, five hundred seventy-three thousand, six hundred ninety-six".