185240228209873 has 2 divisors, whose sum is σ = 185240228209874. Its totient is φ = 185240228209872.

The previous prime is 185240228209853. The next prime is 185240228209909. The reversal of 185240228209873 is 378902822042581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182161666705984 + 3078561503889 = 13496728^2 + 1754583^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-185240228209873 is a prime.

It is a super-2 number, since 2×185240228209873² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (185240228209853) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92620114104936 + 92620114104937.

It is an arithmetic number, because the mean of its divisors is an integer number (92620114104937).

Almost surely, 2^{185240228209873} is an apocalyptic number.

It is an amenable number.

185240228209873 is a deficient number, since it is larger than the sum of its proper divisors (1).

185240228209873 is an equidigital number, since it uses as much as digits as its factorization.

185240228209873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30965760, while the sum is 61.

The spelling of 185240228209873 in words is "one hundred eighty-five trillion, two hundred forty billion, two hundred twenty-eight million, two hundred nine thousand, eight hundred seventy-three".