208979145209 has 8 divisors (see below), whose sum is σ = 217479850560. Its totient is φ = 200564741776.

The previous prime is 208979145197. The next prime is 208979145211. The reversal of 208979145209 is 902541979802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 208979145209 - 2³⁶ = 140259668473 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (208979145409) 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, 21570539 + ... + 21580224.

It is an arithmetic number, because the mean of its divisors is an integer number (27184981320).

Almost surely, 2^208979145209 is an apocalyptic number.

208979145209 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

208979145209 is a deficient number, since it is larger than the sum of its proper divisors (8500705351).

208979145209 is a wasteful number, since it uses less digits than its factorization.

208979145209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43150959.

The product of its (nonzero) digits is 3265920, while the sum is 56.

The spelling of 208979145209 in words is "two hundred eight billion, nine hundred seventy-nine million, one hundred forty-five thousand, two hundred nine".