667181440069 has 2 divisors, whose sum is σ = 667181440070. Its totient is φ = 667181440068.

The previous prime is 667181440067. The next prime is 667181440073. The reversal of 667181440069 is 960044181766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 661603292100 + 5578147969 = 813390^2 + 74687^2 .

It is a cyclic number.

It is not a de Polignac number, because 667181440069 - 2¹ = 667181440067 is a prime.

It is a super-2 number, since 2×667181440069² (a number of 24 digits) contains 22 as substring.

Together with 667181440067, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 667181439998 and 667181440025.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667181440067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333590720034 + 333590720035.

It is an arithmetic number, because the mean of its divisors is an integer number (333590720035).

Almost surely, 2^667181440069 is an apocalyptic number.

It is an amenable number.

667181440069 is a deficient number, since it is larger than the sum of its proper divisors (1).

667181440069 is an equidigital number, since it uses as much as digits as its factorization.

667181440069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1741824, while the sum is 52.

The spelling of 667181440069 in words is "six hundred sixty-seven billion, one hundred eighty-one million, four hundred forty thousand, sixty-nine".