7216385965 has 4 divisors (see below), whose sum is σ = 8659663164. Its totient is φ = 5773108768.

The previous prime is 7216385963. The next prime is 7216385977. The reversal of 7216385965 is 5695836127.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5177953764 + 2038432201 = 71958^2 + 45149^2 .

It is a cyclic number.

It is not a de Polignac number, because 7216385965 - 2¹ = 7216385963 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7216385963) 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, 721638592 + ... + 721638601.

It is an arithmetic number, because the mean of its divisors is an integer number (2164915791).

Almost surely, 2^7216385965 is an apocalyptic number.

It is an amenable number.

7216385965 is a deficient number, since it is larger than the sum of its proper divisors (1443277199).

7216385965 is a wasteful number, since it uses less digits than its factorization.

7216385965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443277198.

The product of its digits is 2721600, while the sum is 52.

The square root of 7216385965 is about 84949.3140937583. The cubic root of 7216385965 is about 1932.4425181791.

The spelling of 7216385965 in words is "seven billion, two hundred sixteen million, three hundred eighty-five thousand, nine hundred sixty-five".