1668860736816 has 120 divisors (see below), whose sum is σ = 5400873582384. Its totient is φ = 440139087360.

The previous prime is 1668860736757. The next prime is 1668860736841. The reversal of 1668860736816 is 6186370688661.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27259795 + ... + 27320946.

Almost surely, 2^{1668860736816} is an apocalyptic number.

1668860736816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1668860736816 is an abundant number, since it is smaller than the sum of its proper divisors (3732012845568).

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

1668860736816 is a wasteful number, since it uses less digits than its factorization.

1668860736816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54580779 (or 54580766 counting only the distinct ones).

The product of its (nonzero) digits is 83607552, while the sum is 66.

The spelling of 1668860736816 in words is "one trillion, six hundred sixty-eight billion, eight hundred sixty million, seven hundred thirty-six thousand, eight hundred sixteen".