666713807 has 8 divisors (see below), whose sum is σ = 690678912. Its totient is φ = 642902400.

The previous prime is 666713779. The next prime is 666713809. The reversal of 666713807 is 708317666.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666713807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666713809) 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, 29558 + ... + 46979.

It is an arithmetic number, because the mean of its divisors is an integer number (86334864).

Almost surely, 2^666713807 is an apocalyptic number.

666713807 is a deficient number, since it is larger than the sum of its proper divisors (23965105).

666713807 is a wasteful number, since it uses less digits than its factorization.

666713807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76849.

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 666713807 is about 25820.8018272090. The cubic root of 666713807 is about 873.6010546881.

The spelling of 666713807 in words is "six hundred sixty-six million, seven hundred thirteen thousand, eight hundred seven".