2194447666 has 16 divisors (see below), whose sum is σ = 3324404160. Its totient is φ = 1086361200.

The previous prime is 2194447663. The next prime is 2194447667. The reversal of 2194447666 is 6667444912.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2194447663) 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, 80880 + ... + 104548.

It is an arithmetic number, because the mean of its divisors is an integer number (207775260).

Almost surely, 2^2194447666 is an apocalyptic number.

2194447666 is a deficient number, since it is larger than the sum of its proper divisors (1129956494).

2194447666 is a wasteful number, since it uses less digits than its factorization.

2194447666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24129.

The product of its digits is 1741824, while the sum is 49.

The square root of 2194447666 is about 46844.9321271789. The cubic root of 2194447666 is about 1299.4963859925.

The spelling of 2194447666 in words is "two billion, one hundred ninety-four million, four hundred forty-seven thousand, six hundred sixty-six".