16446221878506 has 64 divisors (see below), whose sum is σ = 38361282220800. Its totient is φ = 4698584002560.

The previous prime is 16446221878483. The next prime is 16446221878507. The reversal of 16446221878506 is 60587812264461.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16446221878506.

It is not an unprimeable number, because it can be changed into a prime (16446221878507) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29193610 + ... + 29751626.

It is an arithmetic number, because the mean of its divisors is an integer number (599395034700).

Almost surely, 2^{16446221878506} is an apocalyptic number.

16446221878506 is an abundant number, since it is smaller than the sum of its proper divisors (21915060342294).

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

16446221878506 is a wasteful number, since it uses less digits than its factorization.

16446221878506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572364 (or 572350 counting only the distinct ones).

The product of its (nonzero) digits is 30965760, while the sum is 60.

The spelling of 16446221878506 in words is "sixteen trillion, four hundred forty-six billion, two hundred twenty-one million, eight hundred seventy-eight thousand, five hundred six".