199378680066 has 40 divisors (see below), whose sum is σ = 447904545660. Its totient is φ = 66288691872.

The previous prime is 199378680043. The next prime is 199378680097. The reversal of 199378680066 is 660086873991.

199378680066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 192699050625 + 6679629441 = 438975^2 + 81729^2 .

It is a junction number, because it is equal to n+sod(n) for n = 199378679985 and 199378680012.

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 19 ways as a sum of consecutive naturals, for example, 1518901 + ... + 1644936.

Almost surely, 2^199378680066 is an apocalyptic number.

199378680066 is an abundant number, since it is smaller than the sum of its proper divisors (248525865594).

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

199378680066 is a wasteful number, since it uses less digits than its factorization.

199378680066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3164240 (or 3164231 counting only the distinct ones).

The product of its (nonzero) digits is 23514624, while the sum is 63.

The spelling of 199378680066 in words is "one hundred ninety-nine billion, three hundred seventy-eight million, six hundred eighty thousand, sixty-six".