67221720238672 has 20 divisors (see below), whose sum is σ = 133270968614080. Its totient is φ = 32829212209248.

The previous prime is 67221720238667. The next prime is 67221720238679. The reversal of 67221720238672 is 27683202712276.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67221720238679) 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, 48852993672 + ... + 48852995047.

It is an arithmetic number, because the mean of its divisors is an integer number (6663548430704).

Almost surely, 2^{67221720238672} is an apocalyptic number.

It is an amenable number.

67221720238672 is a deficient number, since it is larger than the sum of its proper divisors (66049248375408).

67221720238672 is a wasteful number, since it uses less digits than its factorization.

67221720238672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97705988770 (or 97705988764 counting only the distinct ones).

The product of its (nonzero) digits is 9483264, while the sum is 55.

The spelling of 67221720238672 in words is "sixty-seven trillion, two hundred twenty-one billion, seven hundred twenty million, two hundred thirty-eight thousand, six hundred seventy-two".