2644201666 has 16 divisors (see below), whose sum is σ = 4067078400. Its totient is φ = 1288638288.

The previous prime is 2644201663. The next prime is 2644201673. The reversal of 2644201666 is 6661024462.

It is not an unprimeable number, because it can be changed into a prime (2644201663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9100 + ... + 73288.

It is an arithmetic number, because the mean of its divisors is an integer number (254192400).

Almost surely, 2^2644201666 is an apocalyptic number.

2644201666 is a deficient number, since it is larger than the sum of its proper divisors (1422876734).

2644201666 is a wasteful number, since it uses less digits than its factorization.

2644201666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64713.

The product of its (nonzero) digits is 82944, while the sum is 37.

The square root of 2644201666 is about 51421.8014659152. The cubic root of 2644201666 is about 1382.8174717681.

The spelling of 2644201666 in words is "two billion, six hundred forty-four million, two hundred one thousand, six hundred sixty-six".