1681863136823 has 2 divisors, whose sum is σ = 1681863136824. Its totient is φ = 1681863136822.

The previous prime is 1681863136817. The next prime is 1681863136829. The reversal of 1681863136823 is 3286313681861.

It is a balanced prime because it is at equal distance from previous prime (1681863136817) and next prime (1681863136829).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1681863136823 is a prime.

It is a super-2 number, since 2×1681863136823² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1681863136829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840931568411 + 840931568412.

It is an arithmetic number, because the mean of its divisors is an integer number (840931568412).

Almost surely, 2^{1681863136823} is an apocalyptic number.

1681863136823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681863136823 is an equidigital number, since it uses as much as digits as its factorization.

1681863136823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5971968, while the sum is 56.

The spelling of 1681863136823 in words is "one trillion, six hundred eighty-one billion, eight hundred sixty-three million, one hundred thirty-six thousand, eight hundred twenty-three".