66720133210 has 16 divisors (see below), whose sum is σ = 120141453600. Its totient is φ = 26678005776.

The previous prime is 66720133187. The next prime is 66720133213. The reversal of 66720133210 is 1233102766.

It is not an unprimeable number, because it can be changed into a prime (66720133213) by changing a digit.

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, 1228020 + ... + 1281199.

It is an arithmetic number, because the mean of its divisors is an integer number (7508840850).

Almost surely, 2^66720133210 is an apocalyptic number.

66720133210 is a deficient number, since it is larger than the sum of its proper divisors (53421320390).

66720133210 is a wasteful number, since it uses less digits than its factorization.

66720133210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2511885.

The product of its (nonzero) digits is 9072, while the sum is 31.

Adding to 66720133210 its reverse (1233102766), we get a palindrome (67953235976).

The spelling of 66720133210 in words is "sixty-six billion, seven hundred twenty million, one hundred thirty-three thousand, two hundred ten".