64944372016 has 80 divisors (see below), whose sum is σ = 131448729600. Its totient is φ = 31045158144.

The previous prime is 64944372013. The next prime is 64944372037. The reversal of 64944372016 is 61027344946.

It is not an unprimeable number, because it can be changed into a prime (64944372013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50618511 + ... + 50619793.

It is an arithmetic number, because the mean of its divisors is an integer number (1643109120).

Almost surely, 2^64944372016 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 64944372016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65724364800).

64944372016 is an abundant number, since it is smaller than the sum of its proper divisors (66504357584).

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

64944372016 is a wasteful number, since it uses less digits than its factorization.

64944372016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2306 (or 2300 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 46.

The spelling of 64944372016 in words is "sixty-four billion, nine hundred forty-four million, three hundred seventy-two thousand, sixteen".