1681707405636 has 96 divisors (see below), whose sum is σ = 4486001304960. Its totient is φ = 544487155200.

The previous prime is 1681707405619. The next prime is 1681707405641. The reversal of 1681707405636 is 6365047071861.

1681707405636 is a `hidden beast` number, since 1 + 6 + 8 + 1 + 7 + 0 + 74 + 0 + 563 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 168616 + ... + 1841696.

It is an arithmetic number, because the mean of its divisors is an integer number (46729180260).

Almost surely, 2^{1681707405636} 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 1681707405636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2243000652480).

1681707405636 is an abundant number, since it is smaller than the sum of its proper divisors (2804293899324).

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

1681707405636 is a wasteful number, since it uses less digits than its factorization.

1681707405636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673362 (or 1673354 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 54.

The spelling of 1681707405636 in words is "one trillion, six hundred eighty-one billion, seven hundred seven million, four hundred five thousand, six hundred thirty-six".