194790515705 has 4 divisors (see below), whose sum is σ = 233748618852. Its totient is φ = 155832412560.

The previous prime is 194790515683. The next prime is 194790515737. The reversal of 194790515705 is 507515097491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 507515097491 = 61 ⋅8319919631.

It can be written as a sum of positive squares in 2 ways, for example, as 129637442704 + 65153073001 = 360052^2 + 255251^2 .

It is not a de Polignac number, because 194790515705 - 2¹² = 194790511609 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19479051566 + ... + 19479051575.

It is an arithmetic number, because the mean of its divisors is an integer number (58437154713).

Almost surely, 2^194790515705 is an apocalyptic number.

It is an amenable number.

194790515705 is a deficient number, since it is larger than the sum of its proper divisors (38958103147).

194790515705 is an equidigital number, since it uses as much as digits as its factorization.

194790515705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38958103146.

The product of its (nonzero) digits is 1984500, while the sum is 53.

The spelling of 194790515705 in words is "one hundred ninety-four billion, seven hundred ninety million, five hundred fifteen thousand, seven hundred five".