7218454556 has 12 divisors (see below), whose sum is σ = 12784492392. Its totient is φ = 3565742448.

The previous prime is 7218454487. The next prime is 7218454561. The reversal of 7218454556 is 6554548127.

It is a self number, because there is not a number n which added to its sum of digits gives 7218454556.

It is a congruent number.

It is an unprimeable number.

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, 10870835 + ... + 10871498.

It is an arithmetic number, because the mean of its divisors is an integer number (1065374366).

Almost surely, 2^7218454556 is an apocalyptic number.

It is an amenable number.

7218454556 is a deficient number, since it is larger than the sum of its proper divisors (5566037836).

7218454556 is a wasteful number, since it uses less digits than its factorization.

7218454556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21742420 (or 21742418 counting only the distinct ones).

The product of its digits is 1344000, while the sum is 47.

The square root of 7218454556 is about 84961.4886639823. The cubic root of 7218454556 is about 1932.6271466678.

The spelling of 7218454556 in words is "seven billion, two hundred eighteen million, four hundred fifty-four thousand, five hundred fifty-six".