665043343340567 has 32 divisors (see below), whose sum is σ = 700590054698496. Its totient is φ = 630079687036800.

The previous prime is 665043343340449. The next prime is 665043343340573. The reversal of 665043343340567 is 765043343340566.

It is a happy number.

It is not a de Polignac number, because 665043343340567 - 2³⁶ = 664974623863831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665043343340767) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1808124392 + ... + 1808492162.

It is an arithmetic number, because the mean of its divisors is an integer number (21893439209328).

Almost surely, 2^{665043343340567} is an apocalyptic number.

665043343340567 is a deficient number, since it is larger than the sum of its proper divisors (35546711357929).

665043343340567 is a wasteful number, since it uses less digits than its factorization.

665043343340567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369671.

The product of its (nonzero) digits is 195955200, while the sum is 59.

Subtracting 665043343340567 from its reverse (765043343340566), we obtain a palindrome (99999999999999).

The spelling of 665043343340567 in words is "six hundred sixty-five trillion, forty-three billion, three hundred forty-three million, three hundred forty thousand, five hundred sixty-seven".