209747306316 has 12 divisors (see below), whose sum is σ = 489410381432. Its totient is φ = 69915768768.

The previous prime is 209747306299. The next prime is 209747306317. The reversal of 209747306316 is 613603747902.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (209747306317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8739471085 + ... + 8739471108.

Almost surely, 2^209747306316 is an apocalyptic number.

It is an amenable number.

209747306316 is an abundant number, since it is smaller than the sum of its proper divisors (279663075116).

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

209747306316 is a wasteful number, since it uses less digits than its factorization.

209747306316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17478942200 (or 17478942198 counting only the distinct ones).

The product of its (nonzero) digits is 1143072, while the sum is 48.

The spelling of 209747306316 in words is "two hundred nine billion, seven hundred forty-seven million, three hundred six thousand, three hundred sixteen".