2125864816 has 10 divisors (see below), whose sum is σ = 4118863112. Its totient is φ = 1062932400.

The previous prime is 2125864789. The next prime is 2125864817. The reversal of 2125864816 is 6184685212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2125864817) by changing a digit.

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 as a sum of consecutive naturals, namely, 66433260 + ... + 66433291.

Almost surely, 2^2125864816 is an apocalyptic number.

It is an amenable number.

2125864816 is a deficient number, since it is larger than the sum of its proper divisors (1992998296).

2125864816 is a wasteful number, since it uses less digits than its factorization.

2125864816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132866559 (or 132866553 counting only the distinct ones).

The product of its digits is 184320, while the sum is 43.

The square root of 2125864816 is about 46107.1015788241. The cubic root of 2125864816 is about 1285.8151783777.

The spelling of 2125864816 in words is "two billion, one hundred twenty-five million, eight hundred sixty-four thousand, eight hundred sixteen".