243103220106561 has 48 divisors (see below), whose sum is σ = 372517575288768. Its totient is φ = 152243191526400.

The previous prime is 243103220106557. The next prime is 243103220106577. The reversal of 243103220106561 is 165601022301342.

243103220106561 is a `hidden beast` number, since 2 + 4 + 31 + 0 + 32 + 20 + 10 + 6 + 561 = 666.

It is not a de Polignac number, because 243103220106561 - 2² = 243103220106557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243103220106511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 225392046 + ... + 226468056.

It is an arithmetic number, because the mean of its divisors is an integer number (7760782818516).

Almost surely, 2^{243103220106561} is an apocalyptic number.

It is an amenable number.

243103220106561 is a deficient number, since it is larger than the sum of its proper divisors (129414355182207).

243103220106561 is a wasteful number, since it uses less digits than its factorization.

243103220106561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1078862 (or 1078859 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 243103220106561 in words is "two hundred forty-three trillion, one hundred three billion, two hundred twenty million, one hundred six thousand, five hundred sixty-one".