660260666 has 16 divisors (see below), whose sum is σ = 1081600128. Its totient is φ = 300442800.

The previous prime is 660260663. The next prime is 660260717. The reversal of 660260666 is 666062066.

It is not an unprimeable number, because it can be changed into a prime (660260663) 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 7 ways as a sum of consecutive naturals, for example, 176990 + ... + 180681.

It is an arithmetic number, because the mean of its divisors is an integer number (67600008).

Almost surely, 2^660260666 is an apocalyptic number.

660260666 is a deficient number, since it is larger than the sum of its proper divisors (421339462).

660260666 is a wasteful number, since it uses less digits than its factorization.

660260666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357757.

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 660260666 is about 25695.5378616600. The cubic root of 660260666 is about 870.7733758180.

The spelling of 660260666 in words is "six hundred sixty million, two hundred sixty thousand, six hundred sixty-six".