85438740017881 has 2 divisors, whose sum is σ = 85438740017882. Its totient is φ = 85438740017880.

The previous prime is 85438740017777. The next prime is 85438740017909. The reversal of 85438740017881 is 18871004783458.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83655553688281 + 1783186329600 = 9146341^2 + 1335360^2 .

It is a cyclic number.

It is not a de Polignac number, because 85438740017881 - 2⁷ = 85438740017753 is a prime.

It is a super-2 number, since 2×85438740017881² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85438740417881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42719370008940 + 42719370008941.

It is an arithmetic number, because the mean of its divisors is an integer number (42719370008941).

Almost surely, 2^{85438740017881} is an apocalyptic number.

It is an amenable number.

85438740017881 is a deficient number, since it is larger than the sum of its proper divisors (1).

85438740017881 is an equidigital number, since it uses as much as digits as its factorization.

85438740017881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48168960, while the sum is 64.

The spelling of 85438740017881 in words is "eighty-five trillion, four hundred thirty-eight billion, seven hundred forty million, seventeen thousand, eight hundred eighty-one".