666713407 has 2 divisors, whose sum is σ = 666713408. Its totient is φ = 666713406.

The previous prime is 666713339. The next prime is 666713417. The reversal of 666713407 is 704317666.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666713407 is a prime.

It is a super-3 number, since 3×666713407³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 666713407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666713417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333356703 + 333356704.

It is an arithmetic number, because the mean of its divisors is an integer number (333356704).

Almost surely, 2^666713407 is an apocalyptic number.

666713407 is a deficient number, since it is larger than the sum of its proper divisors (1).

666713407 is an equidigital number, since it uses as much as digits as its factorization.

666713407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 40.

The square root of 666713407 is about 25820.7940815150. The cubic root of 666713407 is about 873.6008799803.

The spelling of 666713407 in words is "six hundred sixty-six million, seven hundred thirteen thousand, four hundred seven".