7216665565271 has 4 divisors (see below), whose sum is σ = 7216708144752. Its totient is φ = 7216622985792.

The previous prime is 7216665565201. The next prime is 7216665565301. The reversal of 7216665565271 is 1725655666127.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7216665565271 is a prime.

It is a super-2 number, since 2×7216665565271² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7216665565271.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7216665565201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21034490 + ... + 21374823.

It is an arithmetic number, because the mean of its divisors is an integer number (1804177036188).

Almost surely, 2^{7216665565271} is an apocalyptic number.

7216665565271 is a deficient number, since it is larger than the sum of its proper divisors (42579481).

7216665565271 is a wasteful number, since it uses less digits than its factorization.

7216665565271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42579480.

The product of its digits is 31752000, while the sum is 59.

The spelling of 7216665565271 in words is "seven trillion, two hundred sixteen billion, six hundred sixty-five million, five hundred sixty-five thousand, two hundred seventy-one".