2685441632821 has 2 divisors, whose sum is σ = 2685441632822. Its totient is φ = 2685441632820.

The previous prime is 2685441632767. The next prime is 2685441632831. The reversal of 2685441632821 is 1282361445862.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1421078568100 + 1264363064721 = 1192090^2 + 1124439^2 .

It is a cyclic number.

It is not a de Polignac number, because 2685441632821 - 2³⁷ = 2548002679349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2685441632831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1342720816410 + 1342720816411.

It is an arithmetic number, because the mean of its divisors is an integer number (1342720816411).

Almost surely, 2^{2685441632821} is an apocalyptic number.

It is an amenable number.

2685441632821 is a deficient number, since it is larger than the sum of its proper divisors (1).

2685441632821 is an equidigital number, since it uses as much as digits as its factorization.

2685441632821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4423680, while the sum is 52.

The spelling of 2685441632821 in words is "two trillion, six hundred eighty-five billion, four hundred forty-one million, six hundred thirty-two thousand, eight hundred twenty-one".