209068949478 has 16 divisors (see below), whose sum is σ = 422197491456. Its totient is φ = 69013051080.

The previous prime is 209068949477. The next prime is 209068949497. The reversal of 209068949478 is 874949860902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209068949471) 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, 169149018 + ... + 169150253.

It is an arithmetic number, because the mean of its divisors is an integer number (26387343216).

Almost surely, 2^209068949478 is an apocalyptic number.

209068949478 is an abundant number, since it is smaller than the sum of its proper divisors (213128541978).

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

209068949478 is a wasteful number, since it uses less digits than its factorization.

209068949478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338299379.

The product of its (nonzero) digits is 62705664, while the sum is 66.

The spelling of 209068949478 in words is "two hundred nine billion, sixty-eight million, nine hundred forty-nine thousand, four hundred seventy-eight".