667746717 has 8 divisors (see below), whose sum is σ = 971268000. Its totient is φ = 404694960.

The previous prime is 667746691. The next prime is 667746749. The reversal of 667746717 is 717647766.

667746717 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 667746717 - 2⁸ = 667746461 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 667746717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667746017) 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, 10117342 + ... + 10117407.

It is an arithmetic number, because the mean of its divisors is an integer number (121408500).

Almost surely, 2^667746717 is an apocalyptic number.

It is an amenable number.

667746717 is a deficient number, since it is larger than the sum of its proper divisors (303521283).

667746717 is a wasteful number, since it uses less digits than its factorization.

667746717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20234763.

The product of its digits is 2074464, while the sum is 51.

The square root of 667746717 is about 25840.7955953372. The cubic root of 667746717 is about 874.0519656416.

The spelling of 667746717 in words is "six hundred sixty-seven million, seven hundred forty-six thousand, seven hundred seventeen".