181853999729 has 2 divisors, whose sum is σ = 181853999730. Its totient is φ = 181853999728.

The previous prime is 181853999699. The next prime is 181853999749. The reversal of 181853999729 is 927999358181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178387969600 + 3466030129 = 422360^2 + 58873^2 .

It is a cyclic number.

It is not a de Polignac number, because 181853999729 - 2³⁶ = 113134522993 is a prime.

It is not a weakly prime, because it can be changed into another prime (181853999749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90926999864 + 90926999865.

It is an arithmetic number, because the mean of its divisors is an integer number (90926999865).

Almost surely, 2^181853999729 is an apocalyptic number.

It is an amenable number.

181853999729 is a deficient number, since it is larger than the sum of its proper divisors (1).

181853999729 is an equidigital number, since it uses as much as digits as its factorization.

181853999729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 88179840, while the sum is 71.

The spelling of 181853999729 in words is "one hundred eighty-one billion, eight hundred fifty-three million, nine hundred ninety-nine thousand, seven hundred twenty-nine".