7218016749 has 12 divisors (see below), whose sum is σ = 10680318012. Its totient is φ = 4694644800.

The previous prime is 7218016717. The next prime is 7218016777. The reversal of 7218016749 is 9476108127.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 327356649 + 6890660100 = 18093^2 + 83010^2 .

It is not a de Polignac number, because 7218016749 - 2⁵ = 7218016717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7218016849) 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 11 ways as a sum of consecutive naturals, for example, 9780142 + ... + 9780879.

It is an arithmetic number, because the mean of its divisors is an integer number (890026501).

Almost surely, 2^7218016749 is an apocalyptic number.

It is an amenable number.

7218016749 is a deficient number, since it is larger than the sum of its proper divisors (3462301263).

7218016749 is a wasteful number, since it uses less digits than its factorization.

7218016749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19561068 (or 19561065 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 7218016749 is about 84958.9121222724. The cubic root of 7218016749 is about 1932.5880739091.

The spelling of 7218016749 in words is "seven billion, two hundred eighteen million, sixteen thousand, seven hundred forty-nine".