2166985788 has 48 divisors (see below), whose sum is σ = 5519708544. Its totient is φ = 656216640.

The previous prime is 2166985781. The next prime is 2166985789. The reversal of 2166985788 is 8875896612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166985781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225906 + ... + 235302.

It is an arithmetic number, because the mean of its divisors is an integer number (114993928).

Almost surely, 2^2166985788 is an apocalyptic number.

It is an amenable number.

2166985788 is an abundant number, since it is smaller than the sum of its proper divisors (3352722756).

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

2166985788 is a wasteful number, since it uses less digits than its factorization.

2166985788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11162 (or 11160 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 60.

The square root of 2166985788 is about 46550.8945993522. The cubic root of 2166985788 is about 1294.0528721607.

The spelling of 2166985788 in words is "two billion, one hundred sixty-six million, nine hundred eighty-five thousand, seven hundred eighty-eight".