2218578145 has 24 divisors (see below), whose sum is σ = 3155405544. Its totient is φ = 1492598016.

The previous prime is 2218578107. The next prime is 2218578181. The reversal of 2218578145 is 5418758122.

It can be written as a sum of positive squares in 4 ways, for example, as 969450496 + 1249127649 = 31136^2 + 35343^2 .

It is not a de Polignac number, because 2218578145 - 2⁷ = 2218578017 is a prime.

It is a Duffinian 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 23 ways as a sum of consecutive naturals, for example, 72444 + ... + 98413.

It is an arithmetic number, because the mean of its divisors is an integer number (131475231).

Almost surely, 2^2218578145 is an apocalyptic number.

It is an amenable number.

2218578145 is a deficient number, since it is larger than the sum of its proper divisors (936827399).

2218578145 is a wasteful number, since it uses less digits than its factorization.

2218578145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170929 (or 170922 counting only the distinct ones).

The product of its digits is 179200, while the sum is 43.

The square root of 2218578145 is about 47101.7849449466. The cubic root of 2218578145 is about 1304.2421861338.

The spelling of 2218578145 in words is "two billion, two hundred eighteen million, five hundred seventy-eight thousand, one hundred forty-five".