843666001920 has 1664 divisors, whose sum is σ = 3623436288000. Its totient is φ = 182184837120.

The previous prime is 843666001907. The next prime is 843666001921. The reversal of 843666001920 is 29100666348.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (843666001921) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 9479393236 + ... + 9479393324.

Almost surely, 2^843666001920 is an apocalyptic number.

843666001920 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 843666001920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1811718144000).

843666001920 is an abundant number, since it is smaller than the sum of its proper divisors (2779770286080).

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

843666001920 is a wasteful number, since it uses less digits than its factorization.

843666001920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The spelling of 843666001920 in words is "eight hundred forty-three billion, six hundred sixty-six million, one thousand, nine hundred twenty".