135220666 has 32 divisors (see below), whose sum is σ = 237219840. Its totient is φ = 56614896.

The previous prime is 135220627. The next prime is 135220697. The reversal of 135220666 is 666022531.

135220666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113325 + ... + 114511.

It is an arithmetic number, because the mean of its divisors is an integer number (7413120).

Almost surely, 2^135220666 is an apocalyptic number.

135220666 is a deficient number, since it is larger than the sum of its proper divisors (101999174).

135220666 is a wasteful number, since it uses less digits than its factorization.

135220666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 135220666 is about 11628.4421140581. The cubic root of 135220666 is about 513.2721381859.

The spelling of 135220666 in words is "one hundred thirty-five million, two hundred twenty thousand, six hundred sixty-six".