805026253781 has 2 divisors, whose sum is σ = 805026253782. Its totient is φ = 805026253780.

The previous prime is 805026253777. The next prime is 805026253813. The reversal of 805026253781 is 187352620508.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 525285754756 + 279740499025 = 724766^2 + 528905^2 .

It is a cyclic number.

It is not a de Polignac number, because 805026253781 - 2² = 805026253777 is a prime.

It is a super-2 number, since 2×805026253781² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (805026253771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 402513126890 + 402513126891.

It is an arithmetic number, because the mean of its divisors is an integer number (402513126891).

Almost surely, 2^805026253781 is an apocalyptic number.

It is an amenable number.

805026253781 is a deficient number, since it is larger than the sum of its proper divisors (1).

805026253781 is an equidigital number, since it uses as much as digits as its factorization.

805026253781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 806400, while the sum is 47.

The spelling of 805026253781 in words is "eight hundred five billion, twenty-six million, two hundred fifty-three thousand, seven hundred eighty-one".