209154422912 has 24 divisors (see below), whose sum is σ = 416685135015. Its totient is φ = 104574624384.

The previous prime is 209154422849. The next prime is 209154422929. The reversal of 209154422912 is 219224451902.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 104577211456 + 104577211456 = 323384^2 + 323384^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=323384.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 209154422912.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5153933 + ... + 5194355.

Almost surely, 2^209154422912 is an apocalyptic number.

It is an amenable number.

209154422912 is a deficient number, since it is larger than the sum of its proper divisors (207530712103).

209154422912 is an frugal number, since it uses more digits than its factorization.

209154422912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80860 (or 40425 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 41.

The spelling of 209154422912 in words is "two hundred nine billion, one hundred fifty-four million, four hundred twenty-two thousand, nine hundred twelve".