1686609744822 has 256 divisors, whose sum is σ = 4292600832000. Its totient is φ = 488255040000.

The previous prime is 1686609744817. The next prime is 1686609744829. The reversal of 1686609744822 is 2284479066861.

1686609744822 is a `hidden beast` number, since 1 + 6 + 8 + 6 + 60 + 97 + 4 + 482 + 2 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1686609744822.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1686609744829) 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, 48868572 + ... + 48903072.

It is an arithmetic number, because the mean of its divisors is an integer number (16767972000).

Almost surely, 2^{1686609744822} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1686609744822, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2146300416000).

1686609744822 is an abundant number, since it is smaller than the sum of its proper divisors (2605991087178).

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

1686609744822 is a wasteful number, since it uses less digits than its factorization.

1686609744822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34644 (or 34638 counting only the distinct ones).

The product of its (nonzero) digits is 55738368, while the sum is 63.

The spelling of 1686609744822 in words is "one trillion, six hundred eighty-six billion, six hundred nine million, seven hundred forty-four thousand, eight hundred twenty-two".