1643550442243 has 16 divisors (see below), whose sum is σ = 1749270358080. Its totient is φ = 1538846171136.

The previous prime is 1643550442241. The next prime is 1643550442271. The reversal of 1643550442243 is 3422440553461.

It is not a de Polignac number, because 1643550442243 - 2¹ = 1643550442241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1643550442243.

It is not an unprimeable number, because it can be changed into a prime (1643550442241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4564330 + ... + 4911232.

It is an arithmetic number, because the mean of its divisors is an integer number (109329397380).

Almost surely, 2^{1643550442243} is an apocalyptic number.

1643550442243 is a deficient number, since it is larger than the sum of its proper divisors (105719915837).

1643550442243 is a wasteful number, since it uses less digits than its factorization.

1643550442243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348366.

The product of its (nonzero) digits is 1382400, while the sum is 43.

The spelling of 1643550442243 in words is "one trillion, six hundred forty-three billion, five hundred fifty million, four hundred forty-two thousand, two hundred forty-three".