19666360660578 has 32 divisors (see below), whose sum is σ = 39675421296000. Its totient is φ = 6498511829376.

The previous prime is 19666360660567. The next prime is 19666360660633. The reversal of 19666360660578 is 87506606366691.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21417283 + ... + 22316646.

It is an arithmetic number, because the mean of its divisors is an integer number (1239856915500).

Almost surely, 2^{19666360660578} is an apocalyptic number.

19666360660578 is an abundant number, since it is smaller than the sum of its proper divisors (20009060635422).

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

19666360660578 is a wasteful number, since it uses less digits than its factorization.

19666360660578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43734586.

The product of its (nonzero) digits is 352719360, while the sum is 69.

The spelling of 19666360660578 in words is "nineteen trillion, six hundred sixty-six billion, three hundred sixty million, six hundred sixty thousand, five hundred seventy-eight".