222126517809 has 45 divisors (see below), whose sum is σ = 386044698171. Its totient is φ = 126912471840.

The previous prime is 222126517759. The next prime is 222126517817. The reversal of 222126517809 is 908715621222.

The square root of 222126517809 is 471303.

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

222126517809 is a `hidden beast` number, since 2 + 2 + 2 + 126 + 517 + 8 + 0 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 192762268209 + 29364249600 = 439047^2 + 171360^2 .

It is not a de Polignac number, because 222126517809 - 2⁹ = 222126517297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (222126517829) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 29688349 + ... + 29695829.

Almost surely, 2^222126517809 is an apocalyptic number.

222126517809 is the 471303-rd square number.

222126517809 is the 235652-nd centered octagonal number.

It is an amenable number.

222126517809 is a deficient number, since it is larger than the sum of its proper divisors (163918180362).

222126517809 is an frugal number, since it uses more digits than its factorization.

222126517809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14988 (or 7491 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 222126517809 in words is "two hundred twenty-two billion, one hundred twenty-six million, five hundred seventeen thousand, eight hundred nine".