1681437919716 has 96 divisors (see below), whose sum is σ = 4423303696000. Its totient is φ = 559183637376.

The previous prime is 1681437919699. The next prime is 1681437919841. The reversal of 1681437919716 is 6179197341861.

1681437919716 is a `hidden beast` number, since 1 + 6 + 8 + 1 + 437 + 9 + 197 + 1 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3565935 + ... + 4009833.

Almost surely, 2^{1681437919716} 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 1681437919716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2211651848000).

1681437919716 is an abundant number, since it is smaller than the sum of its proper divisors (2741865776284).

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

1681437919716 is an equidigital number, since it uses as much as digits as its factorization.

1681437919716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444357 (or 444337 counting only the distinct ones).

The product of its digits is 13716864, while the sum is 63.

The spelling of 1681437919716 in words is "one trillion, six hundred eighty-one billion, four hundred thirty-seven million, nine hundred nineteen thousand, seven hundred sixteen".