667706872217 has 8 divisors (see below), whose sum is σ = 832465710912. Its totient is φ = 520291069200.

The previous prime is 667706872207. The next prime is 667706872219. The reversal of 667706872217 is 712278607766.

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

It is not a de Polignac number, because 667706872217 - 2⁴ = 667706872201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667706872219) 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, 4335758834 + ... + 4335758987.

It is an arithmetic number, because the mean of its divisors is an integer number (104058213864).

Almost surely, 2^667706872217 is an apocalyptic number.

It is an amenable number.

667706872217 is a deficient number, since it is larger than the sum of its proper divisors (164758838695).

667706872217 is a wasteful number, since it uses less digits than its factorization.

667706872217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8671517839.

The product of its (nonzero) digits is 16595712, while the sum is 59.

The spelling of 667706872217 in words is "six hundred sixty-seven billion, seven hundred six million, eight hundred seventy-two thousand, two hundred seventeen".