66505546043 has 4 divisors (see below), whose sum is σ = 70005837960. Its totient is φ = 63005254128.

The previous prime is 66505546007. The next prime is 66505546057. The reversal of 66505546043 is 34064550566.

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 66505546043 - 2⁶ = 66505545979 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66505545985 and 66505546003.

It is not an unprimeable number, because it can be changed into a prime (66505546073) 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, 1750145930 + ... + 1750145967.

It is an arithmetic number, because the mean of its divisors is an integer number (17501459490).

Almost surely, 2^66505546043 is an apocalyptic number.

66505546043 is a deficient number, since it is larger than the sum of its proper divisors (3500291917).

66505546043 is a wasteful number, since it uses less digits than its factorization.

66505546043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3500291916.

The product of its (nonzero) digits is 1296000, while the sum is 44.

The spelling of 66505546043 in words is "sixty-six billion, five hundred five million, five hundred forty-six thousand, forty-three".