12201278978 has 16 divisors (see below), whose sum is σ = 20918191680. Its totient is φ = 5228691216.

The previous prime is 12201278977. The next prime is 12201279031. The reversal of 12201278978 is 87987210221.

It is not an unprimeable number, because it can be changed into a prime (12201278977) 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, 190925 + ... + 246687.

It is an arithmetic number, because the mean of its divisors is an integer number (1307386980).

Almost surely, 2^12201278978 is an apocalyptic number.

12201278978 is a deficient number, since it is larger than the sum of its proper divisors (8716912702).

12201278978 is a wasteful number, since it uses less digits than its factorization.

12201278978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71401.

The product of its (nonzero) digits is 225792, while the sum is 47.

The spelling of 12201278978 in words is "twelve billion, two hundred one million, two hundred seventy-eight thousand, nine hundred seventy-eight".