2543251665 has 16 divisors (see below), whose sum is σ = 4083588288. Its totient is φ = 1351605696.

The previous prime is 2543251651. The next prime is 2543251729. The reversal of 2543251665 is 5661523452.

It is not a de Polignac number, because 2543251665 - 2⁷ = 2543251537 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 295314 + ... + 303803.

It is an arithmetic number, because the mean of its divisors is an integer number (255224268).

Almost surely, 2^2543251665 is an apocalyptic number.

It is an amenable number.

2543251665 is a deficient number, since it is larger than the sum of its proper divisors (1540336623).

2543251665 is a wasteful number, since it uses less digits than its factorization.

2543251665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599408.

The product of its digits is 216000, while the sum is 39.

The square root of 2543251665 is about 50430.6619528239. The cubic root of 2543251665 is about 1364.9909725818.

The spelling of 2543251665 in words is "two billion, five hundred forty-three million, two hundred fifty-one thousand, six hundred sixty-five".