665070666 has 32 divisors (see below), whose sum is σ = 1439914560. Its totient is φ = 203572224.

The previous prime is 665070649. The next prime is 665070667. The reversal of 665070666 is 666070566.

It is not an unprimeable number, because it can be changed into a prime (665070667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7036 + ... + 37143.

It is an arithmetic number, because the mean of its divisors is an integer number (44997330).

Almost surely, 2^665070666 is an apocalyptic number.

665070666 is an abundant number, since it is smaller than the sum of its proper divisors (774843894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665070666 is a wasteful number, since it uses less digits than its factorization.

665070666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44390.

The product of its (nonzero) digits is 272160, while the sum is 42.

The square root of 665070666 is about 25788.9640350286. The cubic root of 665070666 is about 872.8827901932.

The spelling of 665070666 in words is "six hundred sixty-five million, seventy thousand, six hundred sixty-six".