667181440493 has 2 divisors, whose sum is σ = 667181440494. Its totient is φ = 667181440492.

The previous prime is 667181440489. The next prime is 667181440571. The reversal of 667181440493 is 394044181766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 549404123524 + 117777316969 = 741218^2 + 343187^2 .

It is a cyclic number.

It is not a de Polignac number, because 667181440493 - 2² = 667181440489 is a prime.

It is a super-3 number, since 3×667181440493³ (a number of 36 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667181460493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333590720246 + 333590720247.

It is an arithmetic number, because the mean of its divisors is an integer number (333590720247).

Almost surely, 2^667181440493 is an apocalyptic number.

It is an amenable number.

667181440493 is a deficient number, since it is larger than the sum of its proper divisors (1).

667181440493 is an equidigital number, since it uses as much as digits as its factorization.

667181440493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3483648, while the sum is 53.

The spelling of 667181440493 in words is "six hundred sixty-seven billion, one hundred eighty-one million, four hundred forty thousand, four hundred ninety-three".