194639792393 has 2 divisors, whose sum is σ = 194639792394. Its totient is φ = 194639792392.

The previous prime is 194639792383. The next prime is 194639792423. The reversal of 194639792393 is 393297936491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190992598729 + 3647193664 = 437027^2 + 60392^2 .

It is a cyclic number.

It is not a de Polignac number, because 194639792393 - 2¹⁰ = 194639791369 is a prime.

It is not a weakly prime, because it can be changed into another prime (194639792383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97319896196 + 97319896197.

It is an arithmetic number, because the mean of its divisors is an integer number (97319896197).

Almost surely, 2^194639792393 is an apocalyptic number.

It is an amenable number.

194639792393 is a deficient number, since it is larger than the sum of its proper divisors (1).

194639792393 is an equidigital number, since it uses as much as digits as its factorization.

194639792393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 59521392, while the sum is 65.

The spelling of 194639792393 in words is "one hundred ninety-four billion, six hundred thirty-nine million, seven hundred ninety-two thousand, three hundred ninety-three".