845422341781 has 2 divisors, whose sum is σ = 845422341782. Its totient is φ = 845422341780.

The previous prime is 845422341703. The next prime is 845422341787. The reversal of 845422341781 is 187143224548.

845422341781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 725989202500 + 119433139281 = 852050^2 + 345591^2 .

It is a cyclic number.

It is not a de Polignac number, because 845422341781 - 2⁷ = 845422341653 is a prime.

It is a super-2 number, since 2×845422341781² (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 (845422341787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422711170890 + 422711170891.

It is an arithmetic number, because the mean of its divisors is an integer number (422711170891).

Almost surely, 2^845422341781 is an apocalyptic number.

It is an amenable number.

845422341781 is a deficient number, since it is larger than the sum of its proper divisors (1).

845422341781 is an equidigital number, since it uses as much as digits as its factorization.

845422341781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1720320, while the sum is 49.

The spelling of 845422341781 in words is "eight hundred forty-five billion, four hundred twenty-two million, three hundred forty-one thousand, seven hundred eighty-one".