67330557116981 has 2 divisors, whose sum is σ = 67330557116982. Its totient is φ = 67330557116980.

The previous prime is 67330557116959. The next prime is 67330557117007. The reversal of 67330557116981 is 18961175503376.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61665823912081 + 5664733204900 = 7852759^2 + 2380070^2 .

It is a cyclic number.

It is not a de Polignac number, because 67330557116981 - 2⁶ = 67330557116917 is a prime.

It is a super-2 number, since 2×67330557116981² (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 (67330557116281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33665278558490 + 33665278558491.

It is an arithmetic number, because the mean of its divisors is an integer number (33665278558491).

Almost surely, 2^{67330557116981} is an apocalyptic number.

It is an amenable number.

67330557116981 is a deficient number, since it is larger than the sum of its proper divisors (1).

67330557116981 is an equidigital number, since it uses as much as digits as its factorization.

67330557116981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28576800, while the sum is 62.

The spelling of 67330557116981 in words is "sixty-seven trillion, three hundred thirty billion, five hundred fifty-seven million, one hundred sixteen thousand, nine hundred eighty-one".