243646664445 has 64 divisors (see below), whose sum is σ = 468270048000. Its totient is φ = 119778455808.

The previous prime is 243646664441. The next prime is 243646664449. The reversal of 243646664445 is 544466646342.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (243646664441) and next prime (243646664449).

It is not a de Polignac number, because 243646664445 - 2² = 243646664441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243646664391 and 243646664400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243646664441) 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 63 ways as a sum of consecutive naturals, for example, 1188730 + ... + 1378539.

It is an arithmetic number, because the mean of its divisors is an integer number (7316719500).

Almost surely, 2^243646664445 is an apocalyptic number.

It is an amenable number.

243646664445 is a deficient number, since it is larger than the sum of its proper divisors (224623383555).

243646664445 is a wasteful number, since it uses less digits than its factorization.

243646664445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2567339 (or 2567333 counting only the distinct ones).

The product of its digits is 39813120, while the sum is 54.

The spelling of 243646664445 in words is "two hundred forty-three billion, six hundred forty-six million, six hundred sixty-four thousand, four hundred forty-five".