7218942602481 has 27 divisors (see below), whose sum is σ = 11005288171371. Its totient is φ = 4559235444864.

The previous prime is 7218942602423. The next prime is 7218942602491. The reversal of 7218942602481 is 1842062498127.

The square root of 7218942602481 is 2686809.

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

7218942602481 is a `hidden beast` number, since 7 + 2 + 18 + 94 + 2 + 60 + 2 + 481 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7655375025 + 7211287227456 = 87495^2 + 2685384^2 .

It is not a de Polignac number, because 7218942602481 - 2¹⁷ = 7218942471409 is a prime.

It is a super-2 number, since 2×7218942602481² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7218942602401) 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 26 ways as a sum of consecutive naturals, for example, 153124545 + ... + 153171681.

Almost surely, 2^{7218942602481} is an apocalyptic number.

7218942602481 is the 2686809-th square number.

7218942602481 is the 1343405-th centered octagonal number.

It is an amenable number.

7218942602481 is a deficient number, since it is larger than the sum of its proper divisors (3786345568890).

7218942602481 is an frugal number, since it uses more digits than its factorization.

7218942602481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94318 (or 47159 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The spelling of 7218942602481 in words is "seven trillion, two hundred eighteen billion, nine hundred forty-two million, six hundred two thousand, four hundred eighty-one".