2186885664 has 36 divisors (see below), whose sum is σ = 6218956926. Its totient is φ = 728961792.

The previous prime is 2186885647. The next prime is 2186885671. The reversal of 2186885664 is 4665886812.

2186885664 is a `hidden beast` number, since 2 + 18 + 68 + 8 + 566 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1722914064 + 463971600 = 41508^2 + 21540^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 2186885664.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3796389 + ... + 3796964.

Almost surely, 2^2186885664 is an apocalyptic number.

2186885664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2186885664 is an abundant number, since it is smaller than the sum of its proper divisors (4032071262).

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

2186885664 is a wasteful number, since it uses less digits than its factorization.

2186885664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7593369 (or 7593358 counting only the distinct ones).

The product of its digits is 4423680, while the sum is 54.

The square root of 2186885664 is about 46764.1493454120. The cubic root of 2186885664 is about 1298.0019927114.

The spelling of 2186885664 in words is "two billion, one hundred eighty-six million, eight hundred eighty-five thousand, six hundred sixty-four".