366512520821 has 2 divisors, whose sum is σ = 366512520822. Its totient is φ = 366512520820.

The previous prime is 366512520811. The next prime is 366512520877. The reversal of 366512520821 is 128025215663.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 333356116900 + 33156403921 = 577370^2 + 182089^2 .

It is a cyclic number.

It is not a de Polignac number, because 366512520821 - 2¹⁰ = 366512519797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (366512520811) 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, 183256260410 + 183256260411.

It is an arithmetic number, because the mean of its divisors is an integer number (183256260411).

Almost surely, 2^366512520821 is an apocalyptic number.

It is an amenable number.

366512520821 is a deficient number, since it is larger than the sum of its proper divisors (1).

366512520821 is an equidigital number, since it uses as much as digits as its factorization.

366512520821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 366512520821 in words is "three hundred sixty-six billion, five hundred twelve million, five hundred twenty thousand, eight hundred twenty-one".