2551216856 has 32 divisors (see below), whose sum is σ = 4997341440. Its totient is φ = 1218722208.

The previous prime is 2551216819. The next prime is 2551216867. The reversal of 2551216856 is 6586121552.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159245 + ... + 174531.

It is an arithmetic number, because the mean of its divisors is an integer number (156166920).

Almost surely, 2^2551216856 is an apocalyptic number.

It is an amenable number.

2551216856 is a deficient number, since it is larger than the sum of its proper divisors (2446124584).

2551216856 is a wasteful number, since it uses less digits than its factorization.

2551216856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16223 (or 16219 counting only the distinct ones).

The product of its digits is 144000, while the sum is 41.

The square root of 2551216856 is about 50509.5719245372. The cubic root of 2551216856 is about 1366.4144892104.

The spelling of 2551216856 in words is "two billion, five hundred fifty-one million, two hundred sixteen thousand, eight hundred fifty-six".