66123205612 has 24 divisors (see below), whose sum is σ = 115983920304. Its totient is φ = 32985006912.

The previous prime is 66123205583. The next prime is 66123205669. The reversal of 66123205612 is 21650232166.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4977403 + ... + 4990669.

It is an arithmetic number, because the mean of its divisors is an integer number (4832663346).

Almost surely, 2^66123205612 is an apocalyptic number.

It is an amenable number.

66123205612 is a deficient number, since it is larger than the sum of its proper divisors (49860714692).

66123205612 is a wasteful number, since it uses less digits than its factorization.

66123205612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16065 (or 16063 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

Adding to 66123205612 its reverse (21650232166), we get a palindrome (87773437778).

The spelling of 66123205612 in words is "sixty-six billion, one hundred twenty-three million, two hundred five thousand, six hundred twelve".