666109135 has 4 divisors (see below), whose sum is σ = 799330968. Its totient is φ = 532887304.

The previous prime is 666109099. The next prime is 666109151. The reversal of 666109135 is 531901666.

666109135 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 531901666 = 2 ⋅265950833.

It is a cyclic number.

It is not a de Polignac number, because 666109135 - 2⁹ = 666108623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 666109094 and 666109103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66610909 + ... + 66610918.

It is an arithmetic number, because the mean of its divisors is an integer number (199832742).

Almost surely, 2^666109135 is an apocalyptic number.

666109135 is a deficient number, since it is larger than the sum of its proper divisors (133221833).

666109135 is a wasteful number, since it uses less digits than its factorization.

666109135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133221832.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 666109135 is about 25809.0901621890. The cubic root of 666109135 is about 873.3368724322.

The spelling of 666109135 in words is "six hundred sixty-six million, one hundred nine thousand, one hundred thirty-five".