667210721267 has 8 divisors (see below), whose sum is σ = 667751364000. Its totient is φ = 666670296640.

The previous prime is 667210721251. The next prime is 667210721291. The reversal of 667210721267 is 762127012766.

667210721267 is nontrivially palindromic in base 9.

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 667210721267 - 2⁴ = 667210721251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (667210721207) 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, 6368903 + ... + 6472815.

It is an arithmetic number, because the mean of its divisors is an integer number (83468920500).

Almost surely, 2^667210721267 is an apocalyptic number.

667210721267 is a deficient number, since it is larger than the sum of its proper divisors (540642733).

667210721267 is a wasteful number, since it uses less digits than its factorization.

667210721267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109053.

The product of its (nonzero) digits is 592704, while the sum is 47.

The spelling of 667210721267 in words is "six hundred sixty-seven billion, two hundred ten million, seven hundred twenty-one thousand, two hundred sixty-seven".