53871564821 has 2 divisors, whose sum is σ = 53871564822. Its totient is φ = 53871564820.

The previous prime is 53871564797. The next prime is 53871564833. The reversal of 53871564821 is 12846517835.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34219450225 + 19652114596 = 184985^2 + 140186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53871564821 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 53871564821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53871564221) 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, 26935782410 + 26935782411.

It is an arithmetic number, because the mean of its divisors is an integer number (26935782411).

Almost surely, 2^53871564821 is an apocalyptic number.

It is an amenable number.

53871564821 is a deficient number, since it is larger than the sum of its proper divisors (1).

53871564821 is an equidigital number, since it uses as much as digits as its factorization.

53871564821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1612800, while the sum is 50.

The spelling of 53871564821 in words is "fifty-three billion, eight hundred seventy-one million, five hundred sixty-four thousand, eight hundred twenty-one".