2551212645281 has 2 divisors, whose sum is σ = 2551212645282. Its totient is φ = 2551212645280.

The previous prime is 2551212645263. The next prime is 2551212645313. The reversal of 2551212645281 is 1825462121552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1751334624400 + 799878020881 = 1323380^2 + 894359^2 .

It is a cyclic number.

It is not a de Polignac number, because 2551212645281 - 2³⁰ = 2550138903457 is a prime.

It is a super-2 number, since 2×2551212645281² (a number of 26 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2551212645221) 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, 1275606322640 + 1275606322641.

It is an arithmetic number, because the mean of its divisors is an integer number (1275606322641).

Almost surely, 2^{2551212645281} is an apocalyptic number.

It is an amenable number.

2551212645281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2551212645281 is an equidigital number, since it uses as much as digits as its factorization.

2551212645281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384000, while the sum is 44.

The spelling of 2551212645281 in words is "two trillion, five hundred fifty-one billion, two hundred twelve million, six hundred forty-five thousand, two hundred eighty-one".