66298218839 has 4 divisors (see below), whose sum is σ = 66302627160. Its totient is φ = 66293810520.

The previous prime is 66298218821. The next prime is 66298218853. The reversal of 66298218839 is 93881289266.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66298218839 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 (66298218809) 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, 2181524 + ... + 2211705.

It is an arithmetic number, because the mean of its divisors is an integer number (16575656790).

Almost surely, 2^66298218839 is an apocalyptic number.

66298218839 is a deficient number, since it is larger than the sum of its proper divisors (4408321).

66298218839 is a wasteful number, since it uses less digits than its factorization.

66298218839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4408320.

The product of its digits is 17915904, while the sum is 62.

The spelling of 66298218839 in words is "sixty-six billion, two hundred ninety-eight million, two hundred eighteen thousand, eight hundred thirty-nine".