999978866444222 has 32 divisors (see below), whose sum is σ = 1792645532116992. Its totient is φ = 409043848397184.

The previous prime is 999978866444177. The next prime is 999978866444309. The reversal of 999978866444222 is 222444668879999.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3353549003 + ... + 3353847174.

It is an arithmetic number, because the mean of its divisors is an integer number (56020172878656).

Almost surely, 2^{999978866444222} is an apocalyptic number.

999978866444222 is a deficient number, since it is larger than the sum of its proper divisors (792666665672770).

999978866444222 is a wasteful number, since it uses less digits than its factorization.

999978866444222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6707396672.

The product of its digits is 54177693696, while the sum is 89.

The spelling of 999978866444222 in words is "nine hundred ninety-nine trillion, nine hundred seventy-eight billion, eight hundred sixty-six million, four hundred forty-four thousand, two hundred twenty-two".