12216607056778 has 16 divisors (see below), whose sum is σ = 18407643770880. Its totient is φ = 6080727463056.

The previous prime is 12216607056769. The next prime is 12216607056799. The reversal of 12216607056778 is 87765070661221.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14929168 + ... + 15726196.

It is an arithmetic number, because the mean of its divisors is an integer number (1150477735680).

Almost surely, 2^{12216607056778} is an apocalyptic number.

12216607056778 is a deficient number, since it is larger than the sum of its proper divisors (6191036714102).

12216607056778 is a wasteful number, since it uses less digits than its factorization.

12216607056778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831621.

The product of its (nonzero) digits is 11854080, while the sum is 58.

The spelling of 12216607056778 in words is "twelve trillion, two hundred sixteen billion, six hundred seven million, fifty-six thousand, seven hundred seventy-eight".