7216216165 has 4 divisors (see below), whose sum is σ = 8659459404. Its totient is φ = 5772972928.

The previous prime is 7216216159. The next prime is 7216216171. The reversal of 7216216165 is 5616126127.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (7216216159) and next prime (7216216171).

It can be written as a sum of positive squares in 2 ways, for example, as 4828721121 + 2387495044 = 69489^2 + 48862^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7216216165 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 721621612 + ... + 721621621.

It is an arithmetic number, because the mean of its divisors is an integer number (2164864851).

Almost surely, 2^7216216165 is an apocalyptic number.

It is an amenable number.

7216216165 is a deficient number, since it is larger than the sum of its proper divisors (1443243239).

7216216165 is a wasteful number, since it uses less digits than its factorization.

7216216165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443243238.

The product of its digits is 30240, while the sum is 37.

The square root of 7216216165 is about 84948.3146683912. The cubic root of 7216216165 is about 1932.4273614088.

The spelling of 7216216165 in words is "seven billion, two hundred sixteen million, two hundred sixteen thousand, one hundred sixty-five".