2165660212 has 12 divisors (see below), whose sum is σ = 3792827556. Its totient is φ = 1081995200.

The previous prime is 2165660201. The next prime is 2165660239. The reversal of 2165660212 is 2120665612.

It can be written as a sum of positive squares in 2 ways, for example, as 950858896 + 1214801316 = 30836^2 + 34854^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202873 + ... + 213280.

It is an arithmetic number, because the mean of its divisors is an integer number (316068963).

Almost surely, 2^2165660212 is an apocalyptic number.

It is an amenable number.

2165660212 is a deficient number, since it is larger than the sum of its proper divisors (1627167344).

2165660212 is a wasteful number, since it uses less digits than its factorization.

2165660212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417458 (or 417456 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 2165660212 is about 46536.6544994373. The cubic root of 2165660212 is about 1293.7889548291.

The spelling of 2165660212 in words is "two billion, one hundred sixty-five million, six hundred sixty thousand, two hundred twelve".