7216571721664 has 28 divisors (see below), whose sum is σ = 14361417175000. Its totient is φ = 3597946921728.

The previous prime is 7216571721661. The next prime is 7216571721683. The reversal of 7216571721664 is 4661271756127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7216571721661) 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, 161523414 + ... + 161568085.

It is an arithmetic number, because the mean of its divisors is an integer number (512907756250).

Almost surely, 2^{7216571721664} is an apocalyptic number.

It is an amenable number.

7216571721664 is a deficient number, since it is larger than the sum of its proper divisors (7144845453336).

7216571721664 is a wasteful number, since it uses less digits than its factorization.

7216571721664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323091860 (or 323091850 counting only the distinct ones).

The product of its digits is 5927040, while the sum is 55.

The spelling of 7216571721664 in words is "seven trillion, two hundred sixteen billion, five hundred seventy-one million, seven hundred twenty-one thousand, six hundred sixty-four".