891633171996 has 576 divisors, whose sum is σ = 2905943040000. Its totient is φ = 224677753344.

The previous prime is 891633171967. The next prime is 891633172051. The reversal of 891633171996 is 699171336198.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 708206815 + ... + 708208073.

It is an arithmetic number, because the mean of its divisors is an integer number (5045040000).

Almost surely, 2^891633171996 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 891633171996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1452971520000).

891633171996 is an abundant number, since it is smaller than the sum of its proper divisors (2014309868004).

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

891633171996 is a wasteful number, since it uses less digits than its factorization.

891633171996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1486 (or 1481 counting only the distinct ones).

The product of its digits is 13226976, while the sum is 63.

The spelling of 891633171996 in words is "eight hundred ninety-one billion, six hundred thirty-three million, one hundred seventy-one thousand, nine hundred ninety-six".