194891507268 has 24 divisors (see below), whose sum is σ = 459161871168. Its totient is φ = 64333118496.

The previous prime is 194891507263. The next prime is 194891507273. The reversal of 194891507268 is 862705198491.

It is an interprime number because it is at equal distance from previous prime (194891507263) and next prime (194891507273).

It is not an unprimeable number, because it can be changed into a prime (194891507263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78838371 + ... + 78840842.

It is an arithmetic number, because the mean of its divisors is an integer number (19131744632).

Almost surely, 2^194891507268 is an apocalyptic number.

It is an amenable number.

194891507268 is an abundant number, since it is smaller than the sum of its proper divisors (264270363900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

194891507268 is a wasteful number, since it uses less digits than its factorization.

194891507268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157679323 (or 157679321 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 60.

The spelling of 194891507268 in words is "one hundred ninety-four billion, eight hundred ninety-one million, five hundred seven thousand, two hundred sixty-eight".