646803863850 has 48 divisors (see below), whose sum is σ = 1604127427488. Its totient is φ = 172475240640.

The previous prime is 646803863831. The next prime is 646803863857. The reversal of 646803863850 is 58368308646.

It is not an unprimeable number, because it can be changed into a prime (646803863857) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6240652 + ... + 6343448.

It is an arithmetic number, because the mean of its divisors is an integer number (33419321406).

Almost surely, 2^646803863850 is an apocalyptic number.

646803863850 is an abundant number, since it is smaller than the sum of its proper divisors (957323563638).

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

646803863850 is a wasteful number, since it uses less digits than its factorization.

646803863850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144759 (or 144754 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 57.

The spelling of 646803863850 in words is "six hundred forty-six billion, eight hundred three million, eight hundred sixty-three thousand, eight hundred fifty".