67794695681 has 2 divisors, whose sum is σ = 67794695682. Its totient is φ = 67794695680.

The previous prime is 67794695623. The next prime is 67794695707. The reversal of 67794695681 is 18659649776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41212654081 + 26582041600 = 203009^2 + 163040^2 .

It is a cyclic number.

It is not a de Polignac number, because 67794695681 - 2³⁴ = 50614826497 is a prime.

It is a super-2 number, since 2×67794695681² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (67794695081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33897347840 + 33897347841.

It is an arithmetic number, because the mean of its divisors is an integer number (33897347841).

Almost surely, 2^67794695681 is an apocalyptic number.

It is an amenable number.

67794695681 is a deficient number, since it is larger than the sum of its proper divisors (1).

67794695681 is an equidigital number, since it uses as much as digits as its factorization.

67794695681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 137168640, while the sum is 68.

The spelling of 67794695681 in words is "sixty-seven billion, seven hundred ninety-four million, six hundred ninety-five thousand, six hundred eighty-one".