805282621081 has 2 divisors, whose sum is σ = 805282621082. Its totient is φ = 805282621080.

The previous prime is 805282621069. The next prime is 805282621097. The reversal of 805282621081 is 180126282508.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 629826355456 + 175456265625 = 793616^2 + 418875^2 .

It is a cyclic number.

It is not a de Polignac number, because 805282621081 - 2⁵ = 805282621049 is a prime.

It is a super-2 number, since 2×805282621081² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (805285621081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402641310540 + 402641310541.

It is an arithmetic number, because the mean of its divisors is an integer number (402641310541).

Almost surely, 2^805282621081 is an apocalyptic number.

It is an amenable number.

805282621081 is a deficient number, since it is larger than the sum of its proper divisors (1).

805282621081 is an equidigital number, since it uses as much as digits as its factorization.

805282621081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122880, while the sum is 43.

The spelling of 805282621081 in words is "eight hundred five billion, two hundred eighty-two million, six hundred twenty-one thousand, eighty-one".