194388825709 has 4 divisors (see below), whose sum is σ = 209341812316. Its totient is φ = 179435839104.

The previous prime is 194388825707. The next prime is 194388825733. The reversal of 194388825709 is 907528883491.

194388825709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 907528883491 = 907 ⋅1000583113.

It can be written as a sum of positive squares in 2 ways, for example, as 31639515625 + 162749310084 = 177875^2 + 403422^2 .

It is a cyclic number.

It is not a de Polignac number, because 194388825709 - 2¹ = 194388825707 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194388825707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7476493284 + ... + 7476493309.

It is an arithmetic number, because the mean of its divisors is an integer number (52335453079).

Almost surely, 2^194388825709 is an apocalyptic number.

It is an amenable number.

194388825709 is a deficient number, since it is larger than the sum of its proper divisors (14952986607).

194388825709 is a wasteful number, since it uses less digits than its factorization.

194388825709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14952986606.

The product of its (nonzero) digits is 34836480, while the sum is 64.

The spelling of 194388825709 in words is "one hundred ninety-four billion, three hundred eighty-eight million, eight hundred twenty-five thousand, seven hundred nine".