181385502073 has 2 divisors, whose sum is σ = 181385502074. Its totient is φ = 181385502072.

The previous prime is 181385502031. The next prime is 181385502107. The reversal of 181385502073 is 370205583181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139519431529 + 41866070544 = 373523^2 + 204612^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181385502073 is a prime.

It is not a weakly prime, because it can be changed into another prime (181385502173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90692751036 + 90692751037.

It is an arithmetic number, because the mean of its divisors is an integer number (90692751037).

Almost surely, 2^181385502073 is an apocalyptic number.

It is an amenable number.

181385502073 is a deficient number, since it is larger than the sum of its proper divisors (1).

181385502073 is an equidigital number, since it uses as much as digits as its factorization.

181385502073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 201600, while the sum is 43.

The spelling of 181385502073 in words is "one hundred eighty-one billion, three hundred eighty-five million, five hundred two thousand, seventy-three".