243636121606 has 4 divisors (see below), whose sum is σ = 365454182412. Its totient is φ = 121818060802.

The previous prime is 243636121601. The next prime is 243636121607. The reversal of 243636121606 is 606121636342.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243636121601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60909030400 + ... + 60909030403.

It is an arithmetic number, because the mean of its divisors is an integer number (91363545603).

Almost surely, 2^243636121606 is an apocalyptic number.

243636121606 is a deficient number, since it is larger than the sum of its proper divisors (121818060806).

243636121606 is a wasteful number, since it uses less digits than its factorization.

243636121606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121818060805.

The product of its (nonzero) digits is 186624, while the sum is 40.

Adding to 243636121606 its reverse (606121636342), we get a palindrome (849757757948).

The spelling of 243636121606 in words is "two hundred forty-three billion, six hundred thirty-six million, one hundred twenty-one thousand, six hundred six".