8001955621 has 16 divisors (see below), whose sum is σ = 9192801600. Its totient is φ = 6888672000.

The previous prime is 8001955579. The next prime is 8001955649. The reversal of 8001955621 is 1265591008.

8001955621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 8001955621 - 2¹¹ = 8001953573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8001955651) 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, 578575 + ... + 592243.

It is an arithmetic number, because the mean of its divisors is an integer number (574550100).

Almost surely, 2^8001955621 is an apocalyptic number.

It is an amenable number.

8001955621 is a deficient number, since it is larger than the sum of its proper divisors (1190845979).

8001955621 is a wasteful number, since it uses less digits than its factorization.

8001955621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16500.

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 8001955621 is about 89453.6506857043. The cubic root of 8001955621 is about 2000.1629551391.

The spelling of 8001955621 in words is "eight billion, one million, nine hundred fifty-five thousand, six hundred twenty-one".