7216718081 has 4 divisors (see below), whose sum is σ = 7271807664. Its totient is φ = 7161628500.

The previous prime is 7216717999. The next prime is 7216718083. The reversal of 7216718081 is 1808176127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7216718081 - 2²⁶ = 7149609217 is a prime.

It is a super-2 number, since 2×7216718081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7216718083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27544595 + ... + 27544856.

It is an arithmetic number, because the mean of its divisors is an integer number (1817951916).

Almost surely, 2^7216718081 is an apocalyptic number.

It is an amenable number.

7216718081 is a deficient number, since it is larger than the sum of its proper divisors (55089583).

7216718081 is a wasteful number, since it uses less digits than its factorization.

7216718081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55089582.

The product of its (nonzero) digits is 37632, while the sum is 41.

The square root of 7216718081 is about 84951.2688604473. The cubic root of 7216718081 is about 1932.4721629919.

The spelling of 7216718081 in words is "seven billion, two hundred sixteen million, seven hundred eighteen thousand, eighty-one".