67816917491 has 2 divisors, whose sum is σ = 67816917492. Its totient is φ = 67816917490.

The previous prime is 67816917481. The next prime is 67816917503. The reversal of 67816917491 is 19471961876.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 67816917491 - 2²⁶ = 67749808627 is a prime.

It is a super-3 number, since 3×67816917491³ (a number of 33 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 67816917491.

It is not a weakly prime, because it can be changed into another prime (67816917451) 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, 33908458745 + 33908458746.

It is an arithmetic number, because the mean of its divisors is an integer number (33908458746).

Almost surely, 2^67816917491 is an apocalyptic number.

67816917491 is a deficient number, since it is larger than the sum of its proper divisors (1).

67816917491 is an equidigital number, since it uses as much as digits as its factorization.

67816917491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4572288, while the sum is 59.

The spelling of 67816917491 in words is "sixty-seven billion, eight hundred sixteen million, nine hundred seventeen thousand, four hundred ninety-one".