1798991856000 has 640 divisors, whose sum is σ = 6744469548960. Its totient is φ = 475211059200.

The previous prime is 1798991855963. The next prime is 1798991856007. The reversal of 1798991856000 is 6581998971.

1798991856000 is a `hidden beast` number, since 1 + 7 + 9 + 8 + 9 + 9 + 18 + 5 + 600 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (640).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1798991856007) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 138665514 + ... + 138678486.

Almost surely, 2^{1798991856000} is an apocalyptic number.

1798991856000 is a gapful number since it is divisible by the number (10) 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 1798991856000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3372234774480).

1798991856000 is an abundant number, since it is smaller than the sum of its proper divisors (4945477692960).

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

1798991856000 is a wasteful number, since it uses less digits than its factorization.

1798991856000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13121 (or 13090 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 63.

The spelling of 1798991856000 in words is "one trillion, seven hundred ninety-eight billion, nine hundred ninety-one million, eight hundred fifty-six thousand".