243561521606 has 16 divisors (see below), whose sum is σ = 393453924864. Its totient is φ = 112410612864.

The previous prime is 243561521573. The next prime is 243561521629. The reversal of 243561521606 is 606125165342.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1893371 + ... + 2017913.

It is an arithmetic number, because the mean of its divisors is an integer number (24590870304).

Almost surely, 2^243561521606 is an apocalyptic number.

243561521606 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

243561521606 is a deficient number, since it is larger than the sum of its proper divisors (149892403258).

243561521606 is a wasteful number, since it uses less digits than its factorization.

243561521606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199775.

The product of its (nonzero) digits is 259200, while the sum is 41.

Adding to 243561521606 its reverse (606125165342), we get a palindrome (849686686948).

The spelling of 243561521606 in words is "two hundred forty-three billion, five hundred sixty-one million, five hundred twenty-one thousand, six hundred six".