667705220317 has 4 divisors (see below), whose sum is σ = 668248513020. Its totient is φ = 667161927616.

The previous prime is 667705220311. The next prime is 667705220431. The reversal of 667705220317 is 713022507766.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 713022507766 = 2 ⋅356511253883.

It can be written as a sum of positive squares in 2 ways, for example, as 659309896441 + 8395323876 = 811979^2 + 91626^2 .

It is a cyclic number.

It is not a de Polignac number, because 667705220317 - 2²⁷ = 667571002589 is a prime.

It is a super-2 number, since 2×667705220317² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667705220311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271644508 + ... + 271646965.

It is an arithmetic number, because the mean of its divisors is an integer number (167062128255).

Almost surely, 2^667705220317 is an apocalyptic number.

It is an amenable number.

667705220317 is a deficient number, since it is larger than the sum of its proper divisors (543292703).

667705220317 is a wasteful number, since it uses less digits than its factorization.

667705220317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543292702.

The product of its (nonzero) digits is 740880, while the sum is 46.

The spelling of 667705220317 in words is "six hundred sixty-seven billion, seven hundred five million, two hundred twenty thousand, three hundred seventeen".