665440167047 has 2 divisors, whose sum is σ = 665440167048. Its totient is φ = 665440167046.

The previous prime is 665440167019. The next prime is 665440167061. The reversal of 665440167047 is 740761044566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665440167047 - 2¹² = 665440162951 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 665440166986 and 665440167004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665440167247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332720083523 + 332720083524.

It is an arithmetic number, because the mean of its divisors is an integer number (332720083524).

Almost surely, 2^665440167047 is an apocalyptic number.

665440167047 is a deficient number, since it is larger than the sum of its proper divisors (1).

665440167047 is an equidigital number, since it uses as much as digits as its factorization.

665440167047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3386880, while the sum is 50.

The spelling of 665440167047 in words is "six hundred sixty-five billion, four hundred forty million, one hundred sixty-seven thousand, forty-seven".