802639304821 has 2 divisors, whose sum is σ = 802639304822. Its totient is φ = 802639304820.

The previous prime is 802639304791. The next prime is 802639304833. The reversal of 802639304821 is 128403936208.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 786174822225 + 16464482596 = 886665^2 + 128314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-802639304821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (802639304881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 401319652410 + 401319652411.

It is an arithmetic number, because the mean of its divisors is an integer number (401319652411).

Almost surely, 2^802639304821 is an apocalyptic number.

It is an amenable number.

802639304821 is a deficient number, since it is larger than the sum of its proper divisors (1).

802639304821 is an equidigital number, since it uses as much as digits as its factorization.

802639304821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 497664, while the sum is 46.

The spelling of 802639304821 in words is "eight hundred two billion, six hundred thirty-nine million, three hundred four thousand, eight hundred twenty-one".