844866464881 has 2 divisors, whose sum is σ = 844866464882. Its totient is φ = 844866464880.

The previous prime is 844866464851. The next prime is 844866464909. The reversal of 844866464881 is 188464668448.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 665358333025 + 179508131856 = 815695^2 + 423684^2 .

It is a cyclic number.

It is not a de Polignac number, because 844866464881 - 2²¹ = 844864367729 is a prime.

It is a super-2 number, since 2×844866464881² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (844866464851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 422433232440 + 422433232441.

It is an arithmetic number, because the mean of its divisors is an integer number (422433232441).

Almost surely, 2^844866464881 is an apocalyptic number.

It is an amenable number.

844866464881 is a deficient number, since it is larger than the sum of its proper divisors (1).

844866464881 is an equidigital number, since it uses as much as digits as its factorization.

844866464881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226492416, while the sum is 67.

The spelling of 844866464881 in words is "eight hundred forty-four billion, eight hundred sixty-six million, four hundred sixty-four thousand, eight hundred eighty-one".