66811144767 has 8 divisors (see below), whose sum is σ = 89288213760. Its totient is φ = 44437419480.

The previous prime is 66811144721. The next prime is 66811144787. The reversal of 66811144767 is 76744111866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66811144767 - 2¹⁹ = 66810620479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66811144787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25834417 + ... + 25837002.

It is an arithmetic number, because the mean of its divisors is an integer number (11161026720).

Almost surely, 2^66811144767 is an apocalyptic number.

66811144767 is a deficient number, since it is larger than the sum of its proper divisors (22477068993).

66811144767 is a wasteful number, since it uses less digits than its factorization.

66811144767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51671853.

The product of its digits is 1354752, while the sum is 51.

The spelling of 66811144767 in words is "sixty-six billion, eight hundred eleven million, one hundred forty-four thousand, seven hundred sixty-seven".