2551650666256 has 10 divisors (see below), whose sum is σ = 4943823165902. Its totient is φ = 1275825333120.

The previous prime is 2551650666209. The next prime is 2551650666259. The reversal of 2551650666256 is 6526660561552.

It can be written as a sum of positive squares in only one way, i.e., 1972103427856 + 579547238400 = 1404316^2 + 761280^2 .

It is a super-2 number, since 2×2551650666256² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2551650666197 and 2551650666206.

It is not an unprimeable number, because it can be changed into a prime (2551650666259) by changing a digit.

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 as a sum of consecutive naturals, namely, 79739083305 + ... + 79739083336.

Almost surely, 2^{2551650666256} is an apocalyptic number.

It is an amenable number.

2551650666256 is a deficient number, since it is larger than the sum of its proper divisors (2392172499646).

2551650666256 is a wasteful number, since it uses less digits than its factorization.

2551650666256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159478166649 (or 159478166643 counting only the distinct ones).

The product of its (nonzero) digits is 19440000, while the sum is 55.

The spelling of 2551650666256 in words is "two trillion, five hundred fifty-one billion, six hundred fifty million, six hundred sixty-six thousand, two hundred fifty-six".