43321775616 has 320 divisors, whose sum is σ = 148390978560. Its totient is φ = 12375410688.

The previous prime is 43321775551. The next prime is 43321775641. The reversal of 43321775616 is 61657712334.

43321775616 is a `hidden beast` number, since 4 + 3 + 3 + 21 + 7 + 7 + 5 + 616 = 666.

It is a congruent number.

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, 7835445 + ... + 7840971.

It is an arithmetic number, because the mean of its divisors is an integer number (463721808).

Almost surely, 2^43321775616 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 43321775616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74195489280).

43321775616 is an abundant number, since it is smaller than the sum of its proper divisors (105069202944).

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

43321775616 is an frugal number, since it uses more digits than its factorization.

43321775616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5573 (or 5539 counting only the distinct ones).

The product of its digits is 635040, while the sum is 45.

The spelling of 43321775616 in words is "forty-three billion, three hundred twenty-one million, seven hundred seventy-five thousand, six hundred sixteen".