1681868380485 has 16 divisors (see below), whose sum is σ = 2807988948864. Its totient is φ = 857996622912.

The previous prime is 1681868380471. The next prime is 1681868380487. The reversal of 1681868380485 is 5840838681861.

It is not a de Polignac number, because 1681868380485 - 2¹⁴ = 1681868364101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681868380487) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2437490062 + ... + 2437490751.

It is an arithmetic number, because the mean of its divisors is an integer number (175499309304).

Almost surely, 2^{1681868380485} is an apocalyptic number.

1681868380485 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1681868380485 is a deficient number, since it is larger than the sum of its proper divisors (1126120568379).

1681868380485 is a wasteful number, since it uses less digits than its factorization.

1681868380485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4874980844.

The product of its (nonzero) digits is 70778880, while the sum is 66.

The spelling of 1681868380485 in words is "one trillion, six hundred eighty-one billion, eight hundred sixty-eight million, three hundred eighty thousand, four hundred eighty-five".