1666651515168 has 48 divisors (see below), whose sum is σ = 4375046916576. Its totient is φ = 555539496960.

The previous prime is 1666651515163. The next prime is 1666651515169. The reversal of 1666651515168 is 8615151566661.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (1666651515163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5757055 + ... + 6039617.

It is an arithmetic number, because the mean of its divisors is an integer number (91146810762).

Almost surely, 2^{1666651515168} is an apocalyptic number.

It is an amenable number.

1666651515168 is an abundant number, since it is smaller than the sum of its proper divisors (2708395401408).

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

1666651515168 is a wasteful number, since it uses less digits than its factorization.

1666651515168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344017 (or 344009 counting only the distinct ones).

The product of its digits is 7776000, while the sum is 57.

The spelling of 1666651515168 in words is "one trillion, six hundred sixty-six billion, six hundred fifty-one million, five hundred fifteen thousand, one hundred sixty-eight".