1681817746363 has 4 divisors (see below), whose sum is σ = 1681998150168. Its totient is φ = 1681637342560.

The previous prime is 1681817746331. The next prime is 1681817746417. The reversal of 1681817746363 is 3636477181861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1681817746363 - 2⁵ = 1681817746331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1681817746303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90187918 + ... + 90206563.

It is an arithmetic number, because the mean of its divisors is an integer number (420499537542).

Almost surely, 2^{1681817746363} is an apocalyptic number.

1681817746363 is a deficient number, since it is larger than the sum of its proper divisors (180403805).

1681817746363 is an equidigital number, since it uses as much as digits as its factorization.

1681817746363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180403804.

The product of its digits is 24385536, while the sum is 61.

The spelling of 1681817746363 in words is "one trillion, six hundred eighty-one billion, eight hundred seventeen million, seven hundred forty-six thousand, three hundred sixty-three".