665440167019 has 2 divisors, whose sum is σ = 665440167020. Its totient is φ = 665440167018.

The previous prime is 665440166971. The next prime is 665440167047. The reversal of 665440167019 is 910761044566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 665440167019 - 2⁹ = 665440166507 is a prime.

It is a super-3 number, since 3×665440167019³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (665440167719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332720083509 + 332720083510.

It is an arithmetic number, because the mean of its divisors is an integer number (332720083510).

Almost surely, 2^665440167019 is an apocalyptic number.

665440167019 is a deficient number, since it is larger than the sum of its proper divisors (1).

665440167019 is an equidigital number, since it uses as much as digits as its factorization.

665440167019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 665440167019 in words is "six hundred sixty-five billion, four hundred forty million, one hundred sixty-seven thousand, nineteen".