655565666 has 8 divisors (see below), whose sum is σ = 1123826880. Its totient is φ = 280956708.

The previous prime is 655565663. The next prime is 655565689. The reversal of 655565666 is 666565556.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (655565663) 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 3 ways as a sum of consecutive naturals, for example, 23413046 + ... + 23413073.

It is an arithmetic number, because the mean of its divisors is an integer number (140478360).

Almost surely, 2^655565666 is an apocalyptic number.

655565666 is a deficient number, since it is larger than the sum of its proper divisors (468261214).

655565666 is a wasteful number, since it uses less digits than its factorization.

655565666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46826128.

The product of its digits is 4860000, while the sum is 50.

The square root of 655565666 is about 25604.0165989635. The cubic root of 655565666 is about 868.7044909929.

The spelling of 655565666 in words is "six hundred fifty-five million, five hundred sixty-five thousand, six hundred sixty-six".