664206507217 has 12 divisors (see below), whose sum is σ = 730102127440. Its totient is φ = 603804330360.

The previous prime is 664206507163. The next prime is 664206507299. The reversal of 664206507217 is 712705602466.

It is not a de Polignac number, because 664206507217 - 2⁷ = 664206507089 is a prime.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664206507317) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4650958 + ... + 4791640.

Almost surely, 2^664206507217 is an apocalyptic number.

It is an amenable number.

664206507217 is a deficient number, since it is larger than the sum of its proper divisors (65895620223).

664206507217 is a wasteful number, since it uses less digits than its factorization.

664206507217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179724 (or 179713 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 46.

The spelling of 664206507217 in words is "six hundred sixty-four billion, two hundred six million, five hundred seven thousand, two hundred seventeen".