2868633521681 has 2 divisors, whose sum is σ = 2868633521682. Its totient is φ = 2868633521680.

The previous prime is 2868633521549. The next prime is 2868633521693. The reversal of 2868633521681 is 1861253368682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2741623966225 + 127009555456 = 1655785^2 + 356384^2 .

It is a cyclic number.

It is not a de Polignac number, because 2868633521681 - 2¹⁸ = 2868633259537 is a prime.

It is a super-2 number, since 2×2868633521681² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2868633521681.

It is not a weakly prime, because it can be changed into another prime (2868633521981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1434316760840 + 1434316760841.

It is an arithmetic number, because the mean of its divisors is an integer number (1434316760841).

Almost surely, 2^{2868633521681} is an apocalyptic number.

It is an amenable number.

2868633521681 is a deficient number, since it is larger than the sum of its proper divisors (1).

2868633521681 is an equidigital number, since it uses as much as digits as its factorization.

2868633521681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19906560, while the sum is 59.

The spelling of 2868633521681 in words is "two trillion, eight hundred sixty-eight billion, six hundred thirty-three million, five hundred twenty-one thousand, six hundred eighty-one".