666682759 has 4 divisors (see below), whose sum is σ = 670929304. Its totient is φ = 662436216.

The previous prime is 666682729. The next prime is 666682771. The reversal of 666682759 is 957286666.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 666682759 - 2⁷ = 666682631 is a prime.

It is a super-2 number, since 2×666682759² = 888931802295704162, which 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 (666682729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2123037 + ... + 2123350.

It is an arithmetic number, because the mean of its divisors is an integer number (167732326).

Almost surely, 2^666682759 is an apocalyptic number.

666682759 is a deficient number, since it is larger than the sum of its proper divisors (4246545).

666682759 is a wasteful number, since it uses less digits than its factorization.

666682759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4246544.

The product of its digits is 6531840, while the sum is 55.

The square root of 666682759 is about 25820.2005995306. The cubic root of 666682759 is about 873.5874936538.

The spelling of 666682759 in words is "six hundred sixty-six million, six hundred eighty-two thousand, seven hundred fifty-nine".