203638693661209 has 9 divisors (see below), whose sum is σ = 203784968300319. Its totient is φ = 203492523971880.

The previous prime is 203638693661203. The next prime is 203638693661213. The reversal of 203638693661209 is 902166396836302.

The square root of 203638693661209 is 14270203.

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., 47459929609 + 203591233731600 = 217853^2 + 14268540^2 .

It is not a de Polignac number, because 203638693661209 - 2⁴¹ = 201439670405657 is a prime.

It is a super-3 number, since 3×203638693661209³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203638693661203) 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, 23731343299 + ... + 23731351879.

It is an arithmetic number, because the mean of its divisors is an integer number (22642774255591).

Almost surely, 2^{203638693661209} is an apocalyptic number.

203638693661209 is the 14270203-rd square number.

203638693661209 is the 7135102-nd centered octagonal number.

It is an amenable number.

203638693661209 is a deficient number, since it is larger than the sum of its proper divisors (146274639110).

203638693661209 is an frugal number, since it uses more digits than its factorization.

203638693661209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20488 (or 10244 counting only the distinct ones).

The product of its (nonzero) digits is 90699264, while the sum is 64.

The spelling of 203638693661209 in words is "two hundred three trillion, six hundred thirty-eight billion, six hundred ninety-three million, six hundred sixty-one thousand, two hundred nine".