2645875666 has 16 divisors (see below), whose sum is σ = 4774512960. Its totient is φ = 1074265200.

The previous prime is 2645875651. The next prime is 2645875717. The reversal of 2645875666 is 6665785462.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4973185 + ... + 4973716.

It is an arithmetic number, because the mean of its divisors is an integer number (298407060).

Almost surely, 2^2645875666 is an apocalyptic number.

2645875666 is a deficient number, since it is larger than the sum of its proper divisors (2128637294).

2645875666 is a wasteful number, since it uses less digits than its factorization.

2645875666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9946929.

The product of its digits is 14515200, while the sum is 55.

The square root of 2645875666 is about 51438.0760332266. The cubic root of 2645875666 is about 1383.1092231064.

The spelling of 2645875666 in words is "two billion, six hundred forty-five million, eight hundred seventy-five thousand, six hundred sixty-six".