66667343804767 has 4 divisors (see below), whose sum is σ = 66815823412800. Its totient is φ = 66518864196736.

The previous prime is 66667343804759. The next prime is 66667343804777. The reversal of 66667343804767 is 76740834376666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66667343804767 - 2³ = 66667343804759 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66667343804767.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66667343804777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74239803343 + ... + 74239804240.

It is an arithmetic number, because the mean of its divisors is an integer number (16703955853200).

Almost surely, 2^{66667343804767} is an apocalyptic number.

66667343804767 is a deficient number, since it is larger than the sum of its proper divisors (148479608033).

66667343804767 is a wasteful number, since it uses less digits than its factorization.

66667343804767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148479608032.

The product of its (nonzero) digits is 3072577536, while the sum is 73.

The spelling of 66667343804767 in words is "sixty-six trillion, six hundred sixty-seven billion, three hundred forty-three million, eight hundred four thousand, seven hundred sixty-seven".