2201681668 has 6 divisors (see below), whose sum is σ = 3852942926. Its totient is φ = 1100840832.

The previous prime is 2201681641. The next prime is 2201681683. The reversal of 2201681668 is 8661861022.

2201681668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2169510084 + 32171584 = 46578^2 + 5672^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2201681668.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 275210205 + ... + 275210212.

Almost surely, 2^2201681668 is an apocalyptic number.

It is an amenable number.

2201681668 is a deficient number, since it is larger than the sum of its proper divisors (1651261258).

2201681668 is a wasteful number, since it uses less digits than its factorization.

2201681668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550420421 (or 550420419 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 2201681668 is about 46922.0808148999. The cubic root of 2201681668 is about 1300.9227507860.

It can be divided in two parts, 22016 and 81668, that added together give a square (103684 = 322²).

The spelling of 2201681668 in words is "two billion, two hundred one million, six hundred eighty-one thousand, six hundred sixty-eight".