3218666785 has 32 divisors (see below), whose sum is σ = 4136140800. Its totient is φ = 2397366720.

The previous prime is 3218666783. The next prime is 3218666807. The reversal of 3218666785 is 5876668123.

It is not a de Polignac number, because 3218666785 - 2¹ = 3218666783 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3218666783) 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 31 ways as a sum of consecutive naturals, for example, 2960512 + ... + 2961598.

It is an arithmetic number, because the mean of its divisors is an integer number (129254400).

Almost surely, 2^3218666785 is an apocalyptic number.

It is an amenable number.

3218666785 is a deficient number, since it is larger than the sum of its proper divisors (917474015).

3218666785 is a wasteful number, since it uses less digits than its factorization.

3218666785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1621.

The product of its digits is 2903040, while the sum is 52.

The square root of 3218666785 is about 56733.2952066069. The cubic root of 3218666785 is about 1476.4724218393.

The spelling of 3218666785 in words is "three billion, two hundred eighteen million, six hundred sixty-six thousand, seven hundred eighty-five".