64939770216 has 96 divisors (see below), whose sum is σ = 178629165000. Its totient is φ = 21310636032.

The previous prime is 64939770197. The next prime is 64939770223. The reversal of 64939770216 is 61207793946.

It is a happy number.

64939770216 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 10029221316 + 54910548900 = 100146^2 + 234330^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1185480 + ... + 1239048.

Almost surely, 2^64939770216 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 64939770216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89314582500).

64939770216 is an abundant number, since it is smaller than the sum of its proper divisors (113689394784).

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

64939770216 is a wasteful number, since it uses less digits than its factorization.

64939770216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53843 (or 53836 counting only the distinct ones).

The product of its (nonzero) digits is 3429216, while the sum is 54.

The spelling of 64939770216 in words is "sixty-four billion, nine hundred thirty-nine million, seven hundred seventy thousand, two hundred sixteen".