668321673 has 8 divisors (see below), whose sum is σ = 905703936. Its totient is φ = 438243600.

The previous prime is 668321657. The next prime is 668321677. The reversal of 668321673 is 376123866.

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

It is not a de Polignac number, because 668321673 - 2⁴ = 668321657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668321677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1825833 + ... + 1826198.

It is an arithmetic number, because the mean of its divisors is an integer number (113212992).

Almost surely, 2^668321673 is an apocalyptic number.

It is an amenable number.

668321673 is a deficient number, since it is larger than the sum of its proper divisors (237382263).

668321673 is a wasteful number, since it uses less digits than its factorization.

668321673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3652095.

The product of its digits is 217728, while the sum is 42.

The square root of 668321673 is about 25851.9181686775. The cubic root of 668321673 is about 874.3027579666.

The spelling of 668321673 in words is "six hundred sixty-eight million, three hundred twenty-one thousand, six hundred seventy-three".