67447607081 has 2 divisors, whose sum is σ = 67447607082. Its totient is φ = 67447607080.

The previous prime is 67447607077. The next prime is 67447607173. The reversal of 67447607081 is 18070674476.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66817597081 + 630010000 = 258491^2 + 25100^2 .

It is a cyclic number.

It is not a de Polignac number, because 67447607081 - 2² = 67447607077 is a prime.

It is a super-2 number, since 2×67447607081² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (67447607021) 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, 33723803540 + 33723803541.

It is an arithmetic number, because the mean of its divisors is an integer number (33723803541).

Almost surely, 2^67447607081 is an apocalyptic number.

It is an amenable number.

67447607081 is a deficient number, since it is larger than the sum of its proper divisors (1).

67447607081 is an equidigital number, since it uses as much as digits as its factorization.

67447607081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1580544, while the sum is 50.

The spelling of 67447607081 in words is "sixty-seven billion, four hundred forty-seven million, six hundred seven thousand, eighty-one".