2166021616 has 40 divisors (see below), whose sum is σ = 4583728944. Its totient is φ = 983362560.

The previous prime is 2166021607. The next prime is 2166021623. The reversal of 2166021616 is 6161206612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 147336 + ... + 161368.

Almost surely, 2^2166021616 is an apocalyptic number.

It is an amenable number.

2166021616 is an abundant number, since it is smaller than the sum of its proper divisors (2417707328).

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

2166021616 is a wasteful number, since it uses less digits than its factorization.

2166021616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14929 (or 14923 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 2166021616 is about 46540.5373411180. The cubic root of 2166021616 is about 1293.8609197190.

The spelling of 2166021616 in words is "two billion, one hundred sixty-six million, twenty-one thousand, six hundred sixteen".