4452666821 has 2 divisors, whose sum is σ = 4452666822. Its totient is φ = 4452666820.

The previous prime is 4452666817. The next prime is 4452666847. The reversal of 4452666821 is 1286662544.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4447422721 + 5244100 = 66689^2 + 2290^2 .

It is a cyclic number.

It is not a de Polignac number, because 4452666821 - 2² = 4452666817 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4452666521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2226333410 + 2226333411.

It is an arithmetic number, because the mean of its divisors is an integer number (2226333411).

Almost surely, 2^4452666821 is an apocalyptic number.

It is an amenable number.

4452666821 is a deficient number, since it is larger than the sum of its proper divisors (1).

4452666821 is an equidigital number, since it uses as much as digits as its factorization.

4452666821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 552960, while the sum is 44.

The square root of 4452666821 is about 66728.3059952821. The cubic root of 4452666821 is about 1645.1546644920.

The spelling of 4452666821 in words is "four billion, four hundred fifty-two million, six hundred sixty-six thousand, eight hundred twenty-one".