86842240081 has 2 divisors, whose sum is σ = 86842240082. Its totient is φ = 86842240080.

The previous prime is 86842240039. The next prime is 86842240109. The reversal of 86842240081 is 18004224868.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70087267600 + 16754972481 = 264740^2 + 129441^2 .

It is a cyclic number.

It is not a de Polignac number, because 86842240081 - 2²¹ = 86840142929 is a prime.

It is a super-2 number, since 2×86842240081² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (86842240031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43421120040 + 43421120041.

It is an arithmetic number, because the mean of its divisors is an integer number (43421120041).

Almost surely, 2^86842240081 is an apocalyptic number.

It is an amenable number.

86842240081 is a deficient number, since it is larger than the sum of its proper divisors (1).

86842240081 is an equidigital number, since it uses as much as digits as its factorization.

86842240081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 196608, while the sum is 43.

The spelling of 86842240081 in words is "eighty-six billion, eight hundred forty-two million, two hundred forty thousand, eighty-one".