209697101970084 has 81 divisors (see below), whose sum is σ = 532194890664801. Its totient is φ = 69619639080960.

The previous prime is 209697101970079. The next prime is 209697101970101. The reversal of 209697101970084 is 480079101796902.

The square root of 209697101970084 is 14480922.

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

It can be written as a sum of positive squares in only one way, i.e., 206446033332900 + 3251068637184 = 14368230^2 + 1803072^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 22329577029 + ... + 22329586419.

Almost surely, 2^{209697101970084} is an apocalyptic number.

209697101970084 is the 14480922-nd square number.

It is an amenable number.

209697101970084 is an abundant number, since it is smaller than the sum of its proper divisors (322497788694717).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209697101970084 is an frugal number, since it uses more digits than its factorization.

209697101970084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19306 (or 9653 counting only the distinct ones).

The product of its (nonzero) digits is 13716864, while the sum is 63.

The spelling of 209697101970084 in words is "two hundred nine trillion, six hundred ninety-seven billion, one hundred one million, nine hundred seventy thousand, eighty-four".