189563406666 has 8 divisors (see below), whose sum is σ = 379126813344. Its totient is φ = 63187802220.

The previous prime is 189563406611. The next prime is 189563406709. The reversal of 189563406666 is 666604365981.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

189563406666 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15796950550 + ... + 15796950561.

It is an arithmetic number, because the mean of its divisors is an integer number (47390851668).

Almost surely, 2^189563406666 is an apocalyptic number.

189563406666 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.

189563406666 is a wasteful number, since it uses less digits than its factorization.

189563406666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31593901116.

The product of its (nonzero) digits is 33592320, while the sum is 60.

The spelling of 189563406666 in words is "one hundred eighty-nine billion, five hundred sixty-three million, four hundred six thousand, six hundred sixty-six".