649683436944 has 160 divisors (see below), whose sum is σ = 1794146595840. Its totient is φ = 202132224000.

The previous prime is 649683436921. The next prime is 649683437017. The reversal of 649683436944 is 449634386946.

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, 43014994 + ... + 43030094.

It is an arithmetic number, because the mean of its divisors is an integer number (11213416224).

Almost surely, 2^649683436944 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 649683436944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (897073297920).

649683436944 is an abundant number, since it is smaller than the sum of its proper divisors (1144463158896).

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

649683436944 is a wasteful number, since it uses less digits than its factorization.

649683436944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16169 (or 16163 counting only the distinct ones).

The product of its digits is 322486272, while the sum is 66.

The spelling of 649683436944 in words is "six hundred forty-nine billion, six hundred eighty-three million, four hundred thirty-six thousand, nine hundred forty-four".