18010723193 has 2 divisors, whose sum is σ = 18010723194. Its totient is φ = 18010723192.

The previous prime is 18010723189. The next prime is 18010723207. The reversal of 18010723193 is 39132701081.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14965118224 + 3045604969 = 122332^2 + 55187^2 .

It is a cyclic number.

It is not a de Polignac number, because 18010723193 - 2² = 18010723189 is a prime.

It is a super-2 number, since 2×18010723193² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18010723793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9005361596 + 9005361597.

It is an arithmetic number, because the mean of its divisors is an integer number (9005361597).

Almost surely, 2^18010723193 is an apocalyptic number.

It is an amenable number.

18010723193 is a deficient number, since it is larger than the sum of its proper divisors (1).

18010723193 is an equidigital number, since it uses as much as digits as its factorization.

18010723193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The spelling of 18010723193 in words is "eighteen billion, ten million, seven hundred twenty-three thousand, one hundred ninety-three".