16001217666 has 48 divisors (see below), whose sum is σ = 41952777984. Its totient is φ = 4302847872.

The previous prime is 16001217653. The next prime is 16001217697. The reversal of 16001217666 is 66671210061.

It is a self number, because there is not a number n which added to its sum of digits gives 16001217666.

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 23 ways as a sum of consecutive naturals, for example, 3732970 + ... + 3737253.

It is an arithmetic number, because the mean of its divisors is an integer number (874016208).

Almost surely, 2^16001217666 is an apocalyptic number.

16001217666 is an abundant number, since it is smaller than the sum of its proper divisors (25951560318).

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

16001217666 is a wasteful number, since it uses less digits than its factorization.

16001217666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7470255 (or 7470252 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The spelling of 16001217666 in words is "sixteen billion, one million, two hundred seventeen thousand, six hundred sixty-six".