668217681143 has 8 divisors (see below), whose sum is σ = 684526486896. Its totient is φ = 651909390400.

The previous prime is 668217681119. The next prime is 668217681149. The reversal of 668217681143 is 341186712866.

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

It is a cyclic number.

It is not a de Polignac number, because 668217681143 - 2³⁶ = 599498204407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668217681149) 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, 4526780 + ... + 4672062.

It is an arithmetic number, because the mean of its divisors is an integer number (85565810862).

Almost surely, 2^668217681143 is an apocalyptic number.

668217681143 is a deficient number, since it is larger than the sum of its proper divisors (16308805753).

668217681143 is a wasteful number, since it uses less digits than its factorization.

668217681143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257505.

The product of its digits is 2322432, while the sum is 53.

The spelling of 668217681143 in words is "six hundred sixty-eight billion, two hundred seventeen million, six hundred eighty-one thousand, one hundred forty-three".