67312745710981 has 2 divisors, whose sum is σ = 67312745710982. Its totient is φ = 67312745710980.

The previous prime is 67312745710967. The next prime is 67312745711051. The reversal of 67312745710981 is 18901754721376.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47012620730625 + 20300124980356 = 6856575^2 + 4505566^2 .

It is a cyclic number.

It is not a de Polignac number, because 67312745710981 - 2⁵ = 67312745710949 is a prime.

It is a super-2 number, since 2×67312745710981² (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 (67312745710181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33656372855490 + 33656372855491.

It is an arithmetic number, because the mean of its divisors is an integer number (33656372855491).

It is a 1-persistent number, because it is pandigital, but 2⋅67312745710981 = 134625491421962 is not.

Almost surely, 2^{67312745710981} is an apocalyptic number.

It is an amenable number.

67312745710981 is a deficient number, since it is larger than the sum of its proper divisors (1).

67312745710981 is an equidigital number, since it uses as much as digits as its factorization.

67312745710981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17781120, while the sum is 61.

The spelling of 67312745710981 in words is "sixty-seven trillion, three hundred twelve billion, seven hundred forty-five million, seven hundred ten thousand, nine hundred eighty-one".