127696666 has 8 divisors (see below), whose sum is σ = 193697460. Its totient is φ = 63130848.

The previous prime is 127696651. The next prime is 127696669. The reversal of 127696666 is 666696721.

It can be written as a sum of positive squares in 2 ways, for example, as 123676641 + 4020025 = 11121^2 + 2005^2 .

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

It is a super-3 number, since 3×127696666³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (127696669) 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, 358521 + ... + 358876.

Almost surely, 2^127696666 is an apocalyptic number.

127696666 is a deficient number, since it is larger than the sum of its proper divisors (66000794).

127696666 is an equidigital number, since it uses as much as digits as its factorization.

127696666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717488.

The product of its digits is 979776, while the sum is 49.

The square root of 127696666 is about 11300.2949519028. The cubic root of 127696666 is about 503.5700041416.

The spelling of 127696666 in words is "one hundred twenty-seven million, six hundred ninety-six thousand, six hundred sixty-six".