194097578617 has 2 divisors, whose sum is σ = 194097578618. Its totient is φ = 194097578616.

The previous prime is 194097578593. The next prime is 194097578629. The reversal of 194097578617 is 716875790491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 125245917801 + 68851660816 = 353901^2 + 262396^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194097578617 is a prime.

It is a super-3 number, since 3×194097578617³ (a number of 35 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (194097578677) 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, 97048789308 + 97048789309.

It is an arithmetic number, because the mean of its divisors is an integer number (97048789309).

Almost surely, 2^194097578617 is an apocalyptic number.

It is an amenable number.

194097578617 is a deficient number, since it is larger than the sum of its proper divisors (1).

194097578617 is an equidigital number, since it uses as much as digits as its factorization.

194097578617 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26671680, while the sum is 64.

The spelling of 194097578617 in words is "one hundred ninety-four billion, ninety-seven million, five hundred seventy-eight thousand, six hundred seventeen".