1985963574823 has 2 divisors, whose sum is σ = 1985963574824. Its totient is φ = 1985963574822.

The previous prime is 1985963574817. The next prime is 1985963574853. The reversal of 1985963574823 is 3284753695891.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1985963574823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1985963574853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992981787411 + 992981787412.

It is an arithmetic number, because the mean of its divisors is an integer number (992981787412).

Almost surely, 2^{1985963574823} is an apocalyptic number.

1985963574823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985963574823 is an equidigital number, since it uses as much as digits as its factorization.

1985963574823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 391910400, while the sum is 70.

The spelling of 1985963574823 in words is "one trillion, nine hundred eighty-five billion, nine hundred sixty-three million, five hundred seventy-four thousand, eight hundred twenty-three".