194149882561 has 2 divisors, whose sum is σ = 194149882562. Its totient is φ = 194149882560.

The previous prime is 194149882541. The next prime is 194149882583. The reversal of 194149882561 is 165288941491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 182943542961 + 11206339600 = 427719^2 + 105860^2 .

It is a cyclic number.

It is not a de Polignac number, because 194149882561 - 2³⁷ = 56710929089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 194149882496 and 194149882505.

It is not a weakly prime, because it can be changed into another prime (194149882501) 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, 97074941280 + 97074941281.

It is an arithmetic number, because the mean of its divisors is an integer number (97074941281).

Almost surely, 2^194149882561 is an apocalyptic number.

It is an amenable number.

194149882561 is a deficient number, since it is larger than the sum of its proper divisors (1).

194149882561 is an equidigital number, since it uses as much as digits as its factorization.

194149882561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4976640, while the sum is 58.

The spelling of 194149882561 in words is "one hundred ninety-four billion, one hundred forty-nine million, eight hundred eighty-two thousand, five hundred sixty-one".