7218478545 has 16 divisors (see below), whose sum is σ = 12228952320. Its totient is φ = 3623393024.

The previous prime is 7218478541. The next prime is 7218478559. The reversal of 7218478545 is 5458748127.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 7218478545 - 2² = 7218478541 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7218478541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14153625 + ... + 14154134.

It is an arithmetic number, because the mean of its divisors is an integer number (764309520).

Almost surely, 2^7218478545 is an apocalyptic number.

It is an amenable number.

7218478545 is a deficient number, since it is larger than the sum of its proper divisors (5010473775).

7218478545 is a wasteful number, since it uses less digits than its factorization.

7218478545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28307784.

The product of its digits is 2508800, while the sum is 51.

The square root of 7218478545 is about 84961.6298395929. The cubic root of 7218478545 is about 1932.6292875574.

The spelling of 7218478545 in words is "seven billion, two hundred eighteen million, four hundred seventy-eight thousand, five hundred forty-five".