666651727 has 16 divisors (see below), whose sum is σ = 807863040. Its totient is φ = 537375168.

The previous prime is 666651721. The next prime is 666651751. The reversal of 666651727 is 727156666.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666651727 is a prime.

It is a super-2 number, since 2×666651727² = 888849050224165058, 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 (666651721) 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 15 ways as a sum of consecutive naturals, for example, 73 + ... + 36514.

It is an arithmetic number, because the mean of its divisors is an integer number (50491440).

Almost surely, 2^666651727 is an apocalyptic number.

666651727 is a deficient number, since it is larger than the sum of its proper divisors (141211313).

666651727 is a wasteful number, since it uses less digits than its factorization.

666651727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36750.

The product of its digits is 635040, while the sum is 46.

The square root of 666651727 is about 25819.5996676943. The cubic root of 666651727 is about 873.5739391871.

The spelling of 666651727 in words is "six hundred sixty-six million, six hundred fifty-one thousand, seven hundred twenty-seven".