217635312196 has 27 divisors (see below), whose sum is σ = 404612780887. Its totient is φ = 102409153280.

The previous prime is 217635312161. The next prime is 217635312197. The reversal of 217635312196 is 691213536712.

The square root of 217635312196 is 466514.

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

It can be written as a sum of positive squares in 4 ways, for example, as 46648900 + 217588663296 = 6830^2 + 466464^2 .

It is a super-2 number, since 2×217635312196² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217635312197) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 15854616 + ... + 15868336.

Almost surely, 2^217635312196 is an apocalyptic number.

217635312196 is the 466514-th square number.

It is an amenable number.

217635312196 is a deficient number, since it is larger than the sum of its proper divisors (186977468691).

217635312196 is an frugal number, since it uses more digits than its factorization.

217635312196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27480 (or 13740 counting only the distinct ones).

The product of its digits is 408240, while the sum is 46.

The spelling of 217635312196 in words is "two hundred seventeen billion, six hundred thirty-five million, three hundred twelve thousand, one hundred ninety-six".