185381913617 has 2 divisors, whose sum is σ = 185381913618. Its totient is φ = 185381913616.

The previous prime is 185381913553. The next prime is 185381913679. The reversal of 185381913617 is 716319183581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119129212801 + 66252700816 = 345151^2 + 257396^2 .

It is an emirp because it is prime and its reverse (716319183581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 185381913617 - 2⁶ = 185381913553 is a prime.

It is not a weakly prime, because it can be changed into another prime (185381913217) 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, 92690956808 + 92690956809.

It is an arithmetic number, because the mean of its divisors is an integer number (92690956809).

Almost surely, 2^185381913617 is an apocalyptic number.

It is an amenable number.

185381913617 is a deficient number, since it is larger than the sum of its proper divisors (1).

185381913617 is an equidigital number, since it uses as much as digits as its factorization.

185381913617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 53.

The spelling of 185381913617 in words is "one hundred eighty-five billion, three hundred eighty-one million, nine hundred thirteen thousand, six hundred seventeen".