181680742753 has 2 divisors, whose sum is σ = 181680742754. Its totient is φ = 181680742752.

The previous prime is 181680742703. The next prime is 181680742811. The reversal of 181680742753 is 357247086181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129004525584 + 52676217169 = 359172^2 + 229513^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181680742753 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 181680742753.

It is not a weakly prime, because it can be changed into another prime (181680742703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90840371376 + 90840371377.

It is an arithmetic number, because the mean of its divisors is an integer number (90840371377).

Almost surely, 2^181680742753 is an apocalyptic number.

It is an amenable number.

181680742753 is a deficient number, since it is larger than the sum of its proper divisors (1).

181680742753 is an equidigital number, since it uses as much as digits as its factorization.

181680742753 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2257920, while the sum is 52.

The spelling of 181680742753 in words is "one hundred eighty-one billion, six hundred eighty million, seven hundred forty-two thousand, seven hundred fifty-three".