66648323811 has 4 divisors (see below), whose sum is σ = 88864431752. Its totient is φ = 44432215872.

The previous prime is 66648323809. The next prime is 66648323837. The reversal of 66648323811 is 11832384666.

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

It is not a de Polignac number, because 66648323811 - 2¹ = 66648323809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66648323881) 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 3 ways as a sum of consecutive naturals, for example, 11108053966 + ... + 11108053971.

It is an arithmetic number, because the mean of its divisors is an integer number (22216107938).

Almost surely, 2^66648323811 is an apocalyptic number.

66648323811 is a deficient number, since it is larger than the sum of its proper divisors (22216107941).

66648323811 is a wasteful number, since it uses less digits than its factorization.

66648323811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22216107940.

The product of its digits is 995328, while the sum is 48.

The spelling of 66648323811 in words is "sixty-six billion, six hundred forty-eight million, three hundred twenty-three thousand, eight hundred eleven".