2165628866 has 32 divisors (see below), whose sum is σ = 3444534720. Its totient is φ = 1019962944.

The previous prime is 2165628851. The next prime is 2165628931. The reversal of 2165628866 is 6688265612.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 264896 + ... + 272948.

It is an arithmetic number, because the mean of its divisors is an integer number (107641710).

Almost surely, 2^2165628866 is an apocalyptic number.

2165628866 is a deficient number, since it is larger than the sum of its proper divisors (1278905854).

2165628866 is a wasteful number, since it uses less digits than its factorization.

2165628866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8210.

The product of its digits is 1658880, while the sum is 50.

The square root of 2165628866 is about 46536.3177099349. The cubic root of 2165628866 is about 1293.7827126520.

The spelling of 2165628866 in words is "two billion, one hundred sixty-five million, six hundred twenty-eight thousand, eight hundred sixty-six".