3556661666 has 32 divisors (see below), whose sum is σ = 5549100480. Its totient is φ = 1708568064.

The previous prime is 3556661663. The next prime is 3556661677. The reversal of 3556661666 is 6661666553.

It is not an unprimeable number, because it can be changed into a prime (3556661663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1349486 + ... + 1352118.

It is an arithmetic number, because the mean of its divisors is an integer number (173409390).

Almost surely, 2^3556661666 is an apocalyptic number.

3556661666 is a deficient number, since it is larger than the sum of its proper divisors (1992438814).

3556661666 is a wasteful number, since it uses less digits than its factorization.

3556661666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2930.

The product of its digits is 3499200, while the sum is 50.

The square root of 3556661666 is about 59637.7536967985. The cubic root of 3556661666 is about 1526.4439128755.

The spelling of 3556661666 in words is "three billion, five hundred fifty-six million, six hundred sixty-one thousand, six hundred sixty-six".