2105064666 has 16 divisors (see below), whose sum is σ = 4677921600. Its totient is φ = 701688204.

The previous prime is 2105064649. The next prime is 2105064697. The reversal of 2105064666 is 6664605012.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2105064666.

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, 19491286 + ... + 19491393.

It is an arithmetic number, because the mean of its divisors is an integer number (292370100).

Almost surely, 2^2105064666 is an apocalyptic number.

2105064666 is an abundant number, since it is smaller than the sum of its proper divisors (2572856934).

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

2105064666 is a wasteful number, since it uses less digits than its factorization.

2105064666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38982690 (or 38982684 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 2105064666 is about 45880.9837078500. The cubic root of 2105064666 is about 1281.6078155866.

Adding to 2105064666 its reverse (6664605012), we get a palindrome (8769669678).

The spelling of 2105064666 in words is "two billion, one hundred five million, sixty-four thousand, six hundred sixty-six".