1989991342080 has 896 divisors, whose sum is σ = 8562023170560. Its totient is φ = 428070666240.

The previous prime is 1989991342057. The next prime is 1989991342081. The reversal of 1989991342080 is 802431999891.

1989991342080 is a `hidden beast` number, since 198 + 9 + 9 + 9 + 13 + 420 + 8 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (896).

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

It is a junction number, because it is equal to n+sod(n) for n = 1989991341999 and 1989991342017.

It is not an unprimeable number, because it can be changed into a prime (1989991342081) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 131596920 + ... + 131612040.

Almost surely, 2^{1989991342080} is an apocalyptic number.

1989991342080 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 1989991342080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4281011585280).

1989991342080 is an abundant number, since it is smaller than the sum of its proper divisors (6572031828480).

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

1989991342080 is a wasteful number, since it uses less digits than its factorization.

1989991342080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15185 (or 15155 counting only the distinct ones).

The product of its (nonzero) digits is 10077696, while the sum is 63.

The spelling of 1989991342080 in words is "one trillion, nine hundred eighty-nine billion, nine hundred ninety-one million, three hundred forty-two thousand, eighty".