2166620728104 has 128 divisors (see below), whose sum is σ = 6878639308800. Its totient is φ = 618991450560.

The previous prime is 2166620728067. The next prime is 2166620728117. The reversal of 2166620728104 is 4018270266612.

It is a self number, because there is not a number n which added to its sum of digits gives 2166620728104.

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, 26314569 + ... + 26396775.

It is an arithmetic number, because the mean of its divisors is an integer number (53739369600).

Almost surely, 2^{2166620728104} is an apocalyptic number.

2166620728104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2166620728104 is an abundant number, since it is smaller than the sum of its proper divisors (4712018580696).

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

2166620728104 is a wasteful number, since it uses less digits than its factorization.

2166620728104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99660 (or 99650 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The spelling of 2166620728104 in words is "two trillion, one hundred sixty-six billion, six hundred twenty million, seven hundred twenty-eight thousand, one hundred four".