1668516668516 has 12 divisors (see below), whose sum is σ = 3073583336880. Its totient is φ = 790350000840.

The previous prime is 1668516668501. The next prime is 1668516668519. The reversal of 1668516668516 is 6158666158661.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1668516668519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10977083270 + ... + 10977083421.

It is an arithmetic number, because the mean of its divisors is an integer number (256131944740).

Almost surely, 2^{1668516668516} is an apocalyptic number.

It is an amenable number.

1668516668516 is a deficient number, since it is larger than the sum of its proper divisors (1405066668364).

1668516668516 is a wasteful number, since it uses less digits than its factorization.

1668516668516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21954166714 (or 21954166712 counting only the distinct ones).

The product of its digits is 74649600, while the sum is 65.

The spelling of 1668516668516 in words is "one trillion, six hundred sixty-eight billion, five hundred sixteen million, six hundred sixty-eight thousand, five hundred sixteen".