67816917481 has 2 divisors, whose sum is σ = 67816917482. Its totient is φ = 67816917480.

The previous prime is 67816917451. The next prime is 67816917491. The reversal of 67816917481 is 18471961876.

67816917481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62254741081 + 5562176400 = 249509^2 + 74580^2 .

It is a cyclic number.

It is not a de Polignac number, because 67816917481 - 2⁷ = 67816917353 is a prime.

It is a super-3 number, since 3×67816917481³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (67816917451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33908458740 + 33908458741.

It is an arithmetic number, because the mean of its divisors is an integer number (33908458741).

Almost surely, 2^67816917481 is an apocalyptic number.

It is an amenable number.

67816917481 is a deficient number, since it is larger than the sum of its proper divisors (1).

67816917481 is an equidigital number, since it uses as much as digits as its factorization.

67816917481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4064256, while the sum is 58.

The spelling of 67816917481 in words is "sixty-seven billion, eight hundred sixteen million, nine hundred seventeen thousand, four hundred eighty-one".