194444640659 has 4 divisors (see below), whose sum is σ = 194454504216. Its totient is φ = 194434777104.

The previous prime is 194444640631. The next prime is 194444640667. The reversal of 194444640659 is 956046444491.

194444640659 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.

It is a cyclic number.

It is not a de Polignac number, because 194444640659 - 2²⁸ = 194176205203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194444640619) 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, 4902149 + ... + 4941654.

It is an arithmetic number, because the mean of its divisors is an integer number (48613626054).

Almost surely, 2^194444640659 is an apocalyptic number.

194444640659 is a deficient number, since it is larger than the sum of its proper divisors (9863557).

194444640659 is an equidigital number, since it uses as much as digits as its factorization.

194444640659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9863556.

The product of its (nonzero) digits is 14929920, while the sum is 56.

The spelling of 194444640659 in words is "one hundred ninety-four billion, four hundred forty-four million, six hundred forty thousand, six hundred fifty-nine".