185222640641 has 2 divisors, whose sum is σ = 185222640642. Its totient is φ = 185222640640.

The previous prime is 185222640613. The next prime is 185222640649. The reversal of 185222640641 is 146046222581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185222640625 + 16 = 430375^2 + 4^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-185222640641 is a prime.

It is not a weakly prime, because it can be changed into another prime (185222640649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 92611320320 + 92611320321.

It is an arithmetic number, because the mean of its divisors is an integer number (92611320321).

Almost surely, 2^185222640641 is an apocalyptic number.

It is an amenable number.

185222640641 is a deficient number, since it is larger than the sum of its proper divisors (1).

185222640641 is an equidigital number, since it uses as much as digits as its factorization.

185222640641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 184320, while the sum is 41.

The spelling of 185222640641 in words is "one hundred eighty-five billion, two hundred twenty-two million, six hundred forty thousand, six hundred forty-one".