543500661 has 24 divisors (see below), whose sum is σ = 805533120. Its totient is φ = 325673920.

The previous prime is 543500609. The next prime is 543500663. The reversal of 543500661 is 166005345.

It is not a de Polignac number, because 543500661 - 2⁶ = 543500597 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (543500663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23896 + ... + 40718.

It is an arithmetic number, because the mean of its divisors is an integer number (33563880).

Almost surely, 2^543500661 is an apocalyptic number.

It is an amenable number.

543500661 is a deficient number, since it is larger than the sum of its proper divisors (262032459).

543500661 is a wasteful number, since it uses less digits than its factorization.

543500661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16937 (or 16926 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 543500661 is about 23313.1006303323. The cubic root of 543500661 is about 816.0811731412.

The spelling of 543500661 in words is "five hundred forty-three million, five hundred thousand, six hundred sixty-one".