1666220722014 has 64 divisors (see below), whose sum is σ = 3640579084800. Its totient is φ = 506759417472.

The previous prime is 1666220722009. The next prime is 1666220722051. The reversal of 1666220722014 is 4102270226661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2175949 + ... + 2840280.

It is an arithmetic number, because the mean of its divisors is an integer number (56884048200).

Almost surely, 2^{1666220722014} is an apocalyptic number.

1666220722014 is an abundant number, since it is smaller than the sum of its proper divisors (1974358362786).

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

1666220722014 is a wasteful number, since it uses less digits than its factorization.

1666220722014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5016369.

The product of its (nonzero) digits is 96768, while the sum is 39.

Adding to 1666220722014 its reverse (4102270226661), we get a palindrome (5768490948675).

The spelling of 1666220722014 in words is "one trillion, six hundred sixty-six billion, two hundred twenty million, seven hundred twenty-two thousand, fourteen".