42068747086781 has 2 divisors, whose sum is σ = 42068747086782. Its totient is φ = 42068747086780.

The previous prime is 42068747086777. The next prime is 42068747086787. The reversal of 42068747086781 is 18768074786024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25606787899225 + 16461959187556 = 5060315^2 + 4057334^2 .

It is a cyclic number.

It is not a de Polignac number, because 42068747086781 - 2² = 42068747086777 is a prime.

It is a super-2 number, since 2×42068747086781² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42068747086787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21034373543390 + 21034373543391.

It is an arithmetic number, because the mean of its divisors is an integer number (21034373543391).

Almost surely, 2^{42068747086781} is an apocalyptic number.

It is an amenable number.

42068747086781 is a deficient number, since it is larger than the sum of its proper divisors (1).

42068747086781 is an equidigital number, since it uses as much as digits as its factorization.

42068747086781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 202309632, while the sum is 68.

The spelling of 42068747086781 in words is "forty-two trillion, sixty-eight billion, seven hundred forty-seven million, eighty-six thousand, seven hundred eighty-one".