643923983048 has 8 divisors (see below), whose sum is σ = 1207357468230. Its totient is φ = 321961991520.

The previous prime is 643923983047. The next prime is 643923983051. The reversal of 643923983048 is 840389329346.

It can be written as a sum of positive squares in only one way, i.e., 627926286724 + 15997696324 = 792418^2 + 126482^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (643923983047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40245248933 + ... + 40245248948.

Almost surely, 2^643923983048 is an apocalyptic number.

It is an amenable number.

643923983048 is a deficient number, since it is larger than the sum of its proper divisors (563433485182).

643923983048 is a wasteful number, since it uses less digits than its factorization.

643923983048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80490497887 (or 80490497883 counting only the distinct ones).

The product of its (nonzero) digits is 26873856, while the sum is 59.

The spelling of 643923983048 in words is "six hundred forty-three billion, nine hundred twenty-three million, nine hundred eighty-three thousand, forty-eight".