243661634650 has 24 divisors (see below), whose sum is σ = 517955018400. Its totient is φ = 83541131760.

The previous prime is 243661634641. The next prime is 243661634651. The reversal of 243661634650 is 56436166342.

It is a self number, because there is not a number n which added to its sum of digits gives 243661634650.

It is not an unprimeable number, because it can be changed into a prime (243661634651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 348087700 + ... + 348088399.

It is an arithmetic number, because the mean of its divisors is an integer number (21581459100).

Almost surely, 2^243661634650 is an apocalyptic number.

243661634650 is an abundant number, since it is smaller than the sum of its proper divisors (274293383750).

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

243661634650 is a wasteful number, since it uses less digits than its factorization.

243661634650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696176118 (or 696176113 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 46.

The spelling of 243661634650 in words is "two hundred forty-three billion, six hundred sixty-one million, six hundred thirty-four thousand, six hundred fifty".