668173377221 has 8 divisors (see below), whose sum is σ = 763648621440. Its totient is φ = 572703609168.

The previous prime is 668173377217. The next prime is 668173377233. The reversal of 668173377221 is 122773371866.

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 668173377221 - 2² = 668173377217 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 (668173377211) 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, 1104161 + ... + 1598598.

It is an arithmetic number, because the mean of its divisors is an integer number (95456077680).

Almost surely, 2^668173377221 is an apocalyptic number.

It is an amenable number.

668173377221 is a deficient number, since it is larger than the sum of its proper divisors (95475244219).

668173377221 is a wasteful number, since it uses less digits than its factorization.

668173377221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2738083.

The product of its digits is 3556224, while the sum is 53.

The spelling of 668173377221 in words is "six hundred sixty-eight billion, one hundred seventy-three million, three hundred seventy-seven thousand, two hundred twenty-one".