19666078012 has 12 divisors (see below), whose sum is σ = 39332156080. Its totient is φ = 8428319136.

The previous prime is 19666078007. The next prime is 19666078013. The reversal of 19666078012 is 21087066691.

19666078012 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19666078013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 351179937 + ... + 351179992.

Almost surely, 2^19666078012 is an apocalyptic number.

It is an amenable number.

19666078012 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

19666078012 is a wasteful number, since it uses less digits than its factorization.

19666078012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702359940 (or 702359938 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 46.

The spelling of 19666078012 in words is "nineteen billion, six hundred sixty-six million, seventy-eight thousand, twelve".