227818153809 has 27 divisors (see below), whose sum is σ = 330727400913. Its totient is φ = 151117948224.

The previous prime is 227818153799. The next prime is 227818153811. The reversal of 227818153809 is 908351818722.

The square root of 227818153809 is 477303.

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

227818153809 is a `hidden beast` number, since 2 + 27 + 8 + 1 + 81 + 538 + 0 + 9 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 9859894209 + 217958259600 = 99297^2 + 466860^2 .

It is not a de Polignac number, because 227818153809 - 2⁵ = 227818153777 is a prime.

It is a super-2 number, since 2×227818153809² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (227818153859) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 557012397 + ... + 557012805.

Almost surely, 2^227818153809 is an apocalyptic number.

227818153809 is the 477303-rd square number.

227818153809 is the 238652-nd centered octagonal number.

It is an amenable number.

227818153809 is a deficient number, since it is larger than the sum of its proper divisors (102909247104).

227818153809 is an frugal number, since it uses more digits than its factorization.

227818153809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1602 (or 801 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 54.

The spelling of 227818153809 in words is "two hundred twenty-seven billion, eight hundred eighteen million, one hundred fifty-three thousand, eight hundred nine".