66835954384 has 20 divisors (see below), whose sum is σ = 129533992900. Its totient is φ = 33407827200.

The previous prime is 66835954373. The next prime is 66835954397. The reversal of 66835954384 is 48345953866.

It can be written as a sum of positive squares in 2 ways, for example, as 37238192784 + 29597761600 = 192972^2 + 172040^2 .

It is a congruent number.

It is an unprimeable number.

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, 579909 + ... + 685540.

It is an arithmetic number, because the mean of its divisors is an integer number (6476699645).

Almost surely, 2^66835954384 is an apocalyptic number.

It is an amenable number.

66835954384 is a deficient number, since it is larger than the sum of its proper divisors (62698038516).

66835954384 is a wasteful number, since it uses less digits than its factorization.

66835954384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1268758 (or 1268752 counting only the distinct ones).

The product of its digits is 74649600, while the sum is 61.

The spelling of 66835954384 in words is "sixty-six billion, eight hundred thirty-five million, nine hundred fifty-four thousand, three hundred eighty-four".