43661222016646 has 24 divisors (see below), whose sum is σ = 73204843345344. Its totient is φ = 19501290226080.

The previous prime is 43661222016617. The next prime is 43661222016647. The reversal of 43661222016646 is 64661022216634.

It is a self number, because there is not a number n which added to its sum of digits gives 43661222016646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43661222016647) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2083460701 + ... + 2083481656.

It is an arithmetic number, because the mean of its divisors is an integer number (3050201806056).

Almost surely, 2^{43661222016646} is an apocalyptic number.

43661222016646 is a deficient number, since it is larger than the sum of its proper divisors (29543621328698).

43661222016646 is a wasteful number, since it uses less digits than its factorization.

43661222016646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4166942416 (or 4166942403 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 49.

The spelling of 43661222016646 in words is "forty-three trillion, six hundred sixty-one billion, two hundred twenty-two million, sixteen thousand, six hundred forty-six".