1216802427878 has 16 divisors (see below), whose sum is σ = 1904859348480. Its totient is φ = 581857618056.

The previous prime is 1216802427859. The next prime is 1216802427899. The reversal of 1216802427878 is 8787242086121.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1779950 + ... + 2366817.

It is an arithmetic number, because the mean of its divisors is an integer number (119053709280).

Almost surely, 2^{1216802427878} is an apocalyptic number.

1216802427878 is a deficient number, since it is larger than the sum of its proper divisors (688056920602).

1216802427878 is a wasteful number, since it uses less digits than its factorization.

1216802427878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4153171.

The product of its (nonzero) digits is 4816896, while the sum is 56.

The spelling of 1216802427878 in words is "one trillion, two hundred sixteen billion, eight hundred two million, four hundred twenty-seven thousand, eight hundred seventy-eight".