209853149818 has 16 divisors (see below), whose sum is σ = 356835316320. Its totient is φ = 91757652336.

The previous prime is 209853149813. The next prime is 209853149843. The reversal of 209853149818 is 818941358902.

It is not an unprimeable number, because it can be changed into a prime (209853149813) 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, 212401480 + ... + 212402467.

It is an arithmetic number, because the mean of its divisors is an integer number (22302207270).

Almost surely, 2^209853149818 is an apocalyptic number.

209853149818 is a deficient number, since it is larger than the sum of its proper divisors (146982166502).

209853149818 is a wasteful number, since it uses less digits than its factorization.

209853149818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424803981.

The product of its (nonzero) digits is 4976640, while the sum is 58.

The spelling of 209853149818 in words is "two hundred nine billion, eight hundred fifty-three million, one hundred forty-nine thousand, eight hundred eighteen".