2165856770 has 32 divisors (see below), whose sum is σ = 4860521856. Its totient is φ = 675072000.

The previous prime is 2165856769. The next prime is 2165856779. The reversal of 2165856770 is 776585612.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2165856779) 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, 1405631 + ... + 1407170.

It is an arithmetic number, because the mean of its divisors is an integer number (151891308).

Almost surely, 2^2165856770 is an apocalyptic number.

2165856770 is an abundant number, since it is smaller than the sum of its proper divisors (2694665086).

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

2165856770 is a wasteful number, since it uses less digits than its factorization.

2165856770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2812826.

The product of its (nonzero) digits is 705600, while the sum is 47.

The square root of 2165856770 is about 46538.7663136873. The cubic root of 2165856770 is about 1293.8280956070.

The spelling of 2165856770 in words is "two billion, one hundred sixty-five million, eight hundred fifty-six thousand, seven hundred seventy".