106542043506581 has 2 divisors, whose sum is σ = 106542043506582. Its totient is φ = 106542043506580.

The previous prime is 106542043506529. The next prime is 106542043506643. The reversal of 106542043506581 is 185605340245601.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103503154322500 + 3038889184081 = 10173650^2 + 1743241^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-106542043506581 is a prime.

It is a super-2 number, since 2×106542043506581² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (106542043506281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53271021753290 + 53271021753291.

It is an arithmetic number, because the mean of its divisors is an integer number (53271021753291).

Almost surely, 2^{106542043506581} is an apocalyptic number.

It is an amenable number.

106542043506581 is a deficient number, since it is larger than the sum of its proper divisors (1).

106542043506581 is an equidigital number, since it uses as much as digits as its factorization.

106542043506581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456000, while the sum is 50.

The spelling of 106542043506581 in words is "one hundred six trillion, five hundred forty-two billion, forty-three million, five hundred six thousand, five hundred eighty-one".