7218690044644 has 45 divisors (see below), whose sum is σ = 13687118217437. Its totient is φ = 3331283962656.

The previous prime is 7218690044623. The next prime is 7218690044647. The reversal of 7218690044644 is 4464400968127.

The square root of 7218690044644 is 2686762.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 7216540795044 + 2149249600 = 2686362^2 + 46360^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7218690044647) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 908121582 + ... + 908129530.

Almost surely, 2^{7218690044644} is an apocalyptic number.

7218690044644 is the 2686762-nd square number.

It is an amenable number.

7218690044644 is a deficient number, since it is larger than the sum of its proper divisors (6468428172793).

7218690044644 is an frugal number, since it uses more digits than its factorization.

7218690044644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15954 (or 7964 counting only the distinct ones).

The product of its (nonzero) digits is 9289728, while the sum is 55.

The spelling of 7218690044644 in words is "seven trillion, two hundred eighteen billion, six hundred ninety million, forty-four thousand, six hundred forty-four".