643923983050 has 96 divisors (see below), whose sum is σ = 1302120230400. Its totient is φ = 236109504960.

The previous prime is 643923983047. The next prime is 643923983051. The reversal of 643923983050 is 50389329346.

It is not an unprimeable number, because it can be changed into a prime (643923983051) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4297291 + ... + 4444609.

It is an arithmetic number, because the mean of its divisors is an integer number (13563752400).

Almost surely, 2^643923983050 is an apocalyptic number.

643923983050 is an abundant number, since it is smaller than the sum of its proper divisors (658196247350).

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

643923983050 is a wasteful number, since it uses less digits than its factorization.

643923983050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147500 (or 147495 counting only the distinct ones).

The product of its (nonzero) digits is 4199040, while the sum is 52.

The spelling of 643923983050 in words is "six hundred forty-three billion, nine hundred twenty-three million, nine hundred eighty-three thousand, fifty".