4451661543 has 8 divisors (see below), whose sum is σ = 6783484288. Its totient is φ = 2543806584.

The previous prime is 4451661521. The next prime is 4451661547. The reversal of 4451661543 is 3451661544.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4451661543 - 2¹⁰ = 4451660519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4451661547) 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 7 ways as a sum of consecutive naturals, for example, 105991921 + ... + 105991962.

It is an arithmetic number, because the mean of its divisors is an integer number (847935536).

Almost surely, 2^4451661543 is an apocalyptic number.

4451661543 is a deficient number, since it is larger than the sum of its proper divisors (2331822745).

4451661543 is a wasteful number, since it uses less digits than its factorization.

4451661543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211983893.

The product of its digits is 172800, while the sum is 39.

The square root of 4451661543 is about 66720.7729496594. The cubic root of 4451661543 is about 1645.0308463896.

Subtracting from 4451661543 its reverse (3451661544), we obtain a palindrome (999999999).

The spelling of 4451661543 in words is "four billion, four hundred fifty-one million, six hundred sixty-one thousand, five hundred forty-three".