66283035821 has 4 divisors (see below), whose sum is σ = 66370596732. Its totient is φ = 66195474912.

The previous prime is 66283035817. The next prime is 66283035839. The reversal of 66283035821 is 12853038266.

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

It can be written as a sum of positive squares in 2 ways, for example, as 44694610921 + 21588424900 = 211411^2 + 146930^2 .

It is a cyclic number.

It is not a de Polignac number, because 66283035821 - 2² = 66283035817 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 (66283035421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43779320 + ... + 43780833.

It is an arithmetic number, because the mean of its divisors is an integer number (16592649183).

Almost surely, 2^66283035821 is an apocalyptic number.

It is an amenable number.

66283035821 is a deficient number, since it is larger than the sum of its proper divisors (87560911).

66283035821 is an equidigital number, since it uses as much as digits as its factorization.

66283035821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87560910.

The product of its (nonzero) digits is 414720, while the sum is 44.

The spelling of 66283035821 in words is "sixty-six billion, two hundred eighty-three million, thirty-five thousand, eight hundred twenty-one".