643299809870 has 96 divisors (see below), whose sum is σ = 1264960139040. Its totient is φ = 234884966400.

The previous prime is 643299809869. The next prime is 643299809989. The reversal of 643299809870 is 78908992346.

It is a junction number, because it is equal to n+sod(n) for n = 643299809797 and 643299809806.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 42535910 + ... + 42551030.

It is an arithmetic number, because the mean of its divisors is an integer number (13176668115).

Almost surely, 2^643299809870 is an apocalyptic number.

643299809870 is a deficient number, since it is larger than the sum of its proper divisors (621660329170).

643299809870 is a wasteful number, since it uses less digits than its factorization.

643299809870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15442 (or 15411 counting only the distinct ones).

The product of its (nonzero) digits is 47029248, while the sum is 65.

The spelling of 643299809870 in words is "six hundred forty-three billion, two hundred ninety-nine million, eight hundred nine thousand, eight hundred seventy".